radiation safety for nuclear medicine – Flashcards
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The use, purchase, transfer, and disposal of RAM is regulated by which agencies?
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NRC State government (Agreement State)
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What responsibilities does an Agreement State have?
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Enforce regulations that are basically equivalent to the NRC (perform inspections, levies fines and citations)
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Byproduct Material
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Any radioactive material yielded or made radioactive by exposure to the radiation incident to the process of producing or utilizing special nuclear material
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Special Nuclear Material
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Plutonium Uranium-233 Uranium enriches in 233 or 235
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Name 2 things that the NRC does NOT regulate
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naturally occurring isotopes such as Ra & Rn machine produced radiation (xrays from diagnostic unit or linear accelerator)
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As of October 2007, name 2 new things that the NRC now regulates
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some accelerator produced and cyclotron produced material (Co-57 and F-18)
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What are the NRC's general duties?
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Write standards and rules License users Inspect licensed facilities Enforce regulations
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Who regulates radioisotopes from accelerator produced sources and from radiation producing machines?
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The Dept of Environmental Protection under the Bureau of Radiation Protection
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How is CFR organized?
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Divided into 50 titles Each title is divided into chapters which usually bears the name of the issuing agency Each chapter is divided into parts covering specific regulatory areas
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The regulations which govern medical use of RAM (byproduct) material are often simply referred to as?
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10 CFR (Title 10- Energy, Chapter 1- NRC, Parts 0-199)
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What is part 19 about?
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Notices, instructions, and reports to works: Inspection & Investigations
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What is part 20 about?
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Standards for Protection against radiation
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What is part 35 about?
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Medical use of Byproduct material
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19.1
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Purpose
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19.2-Scope
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Describes who the regulations apply to
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19.3 Definitions
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Working definitions that should be taken literally and are often the difference between compliance and noncompliance
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19.4 Interpretations
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Says that written documentation is required of any interpretation received from the NRC (anything an NRC Rep tells you on the phone isn't binding w/o written documentation)
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19.5
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Communications
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19.11 Postings of Notices to Workers
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The following documents must be posted conspicuously: Parts 19 & 20 CFR NRC License, conditions, and correspondence Specific operating procedures Notice of violation regarding working conditions NRC Form 3 "Notice to Workers" If it isn't realistic to post any of these documents, must have a document saying where all these things can be found
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How soon should a notice of violation be posted?
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within 2 days of receipt, and must remain posted for at least 5 working days or until corrective action is made
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19.12 instructions to workers
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Requirements for instructing workers about radiation safety (topics to be covered, who instruction s/b given, how often)
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19.13 Notifications and reports to individuals
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Licensee must notify each workers of: Exposure data Total annual occupational dose Dosimetry summary for former works Dosimetry info for a worker who exceeds limits Dosimetry summary for worker who is leaving
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19.14 Presence of Reps of Licensees and Workers During Inspection
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Rights of inspectors and licensee employees during inspection: Licensee must allow NRC to look at records, materials, activities Workers can have a rep and a licensee must notify the inspector who it is Worker's rep must be similarly-employed worker The reps can accompany the inspector Consultant of licensee can accompany inspector NRC can refuse accompaniment
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19.15 Consultation with Workers During Inspection
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rights of a worker to privately talk with NRC inspector about regulation related problems
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19.16. Request by workers for inspection
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Allows worker the right to request an NRC inspection
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19.17 Inspections not warranted, informal review
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Just because a worker requests an inspection doesn't mean that it'll happen, describes how an agency will review the reqest
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19.18 Sequestration of Witnesses and Exclusion of Counsel in Interviews Conducted Under Subpoena
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Describes procedures for witnesses to an investigation, how they are sequestered, and their right to have counsel
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19.20 Employee Protection
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"Whistleblower law" Discrimination of an employee who requests an inspection or cooperates with inspection is prohibited
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19.30 Violations
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Describes how NRC enforces regulations
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19.31 Exemptions
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Licensees may request exemption from any rule in part 19
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19.32 Discrimination
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Prohibits job discrimination by a licensee on the basis of gender
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19.40 Criminal Penalties
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States that criminal sanctions can be levied for willful violation, conspiracy to violate, or attempt to violate any regulation
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What is the Total Effective Dose Equivalent?
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TEDE Concerns the whole body limited to 5 rem/year (0.05 Sv)
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What is Deep Dose Equivalent + Commited Dose Equivalent?
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DDE+CDE Concerns any organ or tissue except the eye 50 rem/year
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What is Lens Dose Equivalent?
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LDE Concerns the lens of the eye 15 rem/year
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What is Shallow Dose Equivalent?
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SDE Concerns the skin, extremities 50 rem/year
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Total Effective Dose Equivalent
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Sum of the deep dose equivalent (for EXTERNAL exposures) and the committed effective dose equivalent (for INTERNAL exposures)
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Deep Dose Equivalent
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Applies to whole body external exposure Dose equivalent at a tissue depth of 1 cm
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What is the 5 rem/year limit based on?
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National Council on Radiation Protecction and Measurements (NCRP) Report 116 which basically says that for occupational exposure, the level of protection provided should make sure that stochastic effects are maintained ALARA, and that the risk to an individual of fatal cancer from radiation exposure shouldn't be greater than the # of fatal accidents in safe industries
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Committed Effective Dose Equivalent
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Sum of the products of the weighting factors applicable to each of the body organs or tissues that are irradiated and the committed dose equivalent to these organs or tissues
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Committed Dose Equivalent
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Dose equivalent to organs or tissues of reference (T) that will be received from an intake of radioactive material by an individual during the 50 year period following the intake
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Lens Dose Equivalent
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Applies to external exposure of the lens of the eye and is taken as the dose equivalent at a tissue depth of 0.3 cm
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Shallow Dose Equivalent
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Applies to external exposure of the skin of the whole body or extremity Dose equivalent at tissue depth of 0.007 cm
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Dose limit to the general public
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<0.1 rem (1 mSv)/year
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The dose limit to the general public dose not include what?
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Background radiation Radiation one has received for medical reasons Radiation from a patient containing RAM Radiation received from voluntary participation in medical research project Radiation from waste legally disposed of in the sewer
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The maximum dose in any one hour in an unrestricted area cannot exceed?
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2 mrem (0.02 mSv)
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Dose limit to occupational workers who are minors
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10% of the annual dose limits specified for adult workers, so 0.5 rem TEDE
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Dose limit to fetus of radiation worker
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0.5 rem (5 mSv)
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The dose equivalent to the fetus is the sum of?
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DDE (to woman) + DE to the fetus resulting from radionuclides in the fetus and radionuclides in the declaered pregnant woman
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What happens if the dose equivalent to the fetus if found to have exceeded 0.5 rem or is within 0.05 rem (0.5 mSv)of this dose by the time the woman declares pregnancy?
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She is deemed to be in compliance as long as the additional dose equivalent to the fetus doesn't exceed 0.05 rem during the remainder of the pregnancy
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Declared Pregnant Woman
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A women who has declared she is pregnant voluntarily to the licensee in writing and given the estimated date of conception Declaration is effective until the woman withdraws the declaration in writing or is not longer pregnant
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What is a "Radiation Area"
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Accessible to individuals individual could receive dose equivalent in excess of 0.005 rem (0.05 mSv) in 1 hour at 30 cm from the source or from any surface that the radiation penetrates Requires controlled access
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High radiation area
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Accessible to individuals could result in individual receiving dose equivalent greater than 0.1 rem (1mSv) in 1 hour at 30 cm from the source A licensee must execute controls to either reduce the dose rate, or set off an audible and visual alarm, keep the entrance locked except to authorized persons, provide surveillance
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Very high radiation area
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Grave danger! Accessible to individuals could receive absorbed dose in excess of 500 rads (5 Gy) in 1 hr at 1 meter from the source Controls required
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Airborne Radioactivity Area
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An enclosure which airborne RAM exists in concentrations in excess of the derived air concentrations (DAC) or to such a degree that someone present in the area w/o respiratory protective equipment could exceed (during the hours an individual is present in a week) an intake of 0.6% of the annual limit on intake (ALI) or 12 DAC hours
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Annual Limit on Intake (ALI)
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Derived Limit for the amount of RAM taken into the body of an adult worker by inhalation or ingestion in a year
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ALI is the smaller value of intake of a given radionuclide in a year by the reference man that would result in a committed effective dose equivalent of?
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5 rems (0.05 Sv) or a committed dose equivalent of 50 rems (0.5 Sv) to any individual organ or tissue
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Derived Air Concentration (DAC)
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Concentration of a given radionuclide in air that if breathed by the reference man for a working year of 2,000 hours under conditions of light work results in an intake of one ALI
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All containers that hold licensed material must be labeled how?
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"Clearly visible" "Durable" With the radiation symbol and the words "Caution: Radioactive Material"
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What must the label also contain?
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Info about the radioisotope, activity, and date of calibration
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What must a licensee do to a RAM container if they wish to dispose of it?
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Remove and deface the radiation warning label
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Name the 3 NRC/Agreement State types of licenses for medical use of byproduct material
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General License Specific License Specific License of Broad Scope
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General License
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Authorizes physicians/vets/clinical labs/hospitals to receive, acquire, possess, or use small quantities of byproduct material for in vitro for tests not for human administration (must have RSC)
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Specific License
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Authorizes physicians/vets/clinical labs/hospitals to receive, acquire, possess, or use larger quantities of byproduct material for in vitro and in vivo use (administration to humans) (Must have RSC, QMP, etc.)
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Specific License of Broad Scope
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Authorizes use as described in a specific license, plus use of experimental and research material for in vitro, animal, and medical procedures (teaching, university hospitals)
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Besides the license name and address, what other things does a specific license contain?
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License # & expiration, amendment #, RAM approved for use w/ approved forms of that material, maximum amount a licensee may possess at any one time, authorized uses of RAM, license conditions
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What do license conditions address?
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Policies, procedures, rules specific to the license which may address: sites where material can be used/stored name of RSO and authorized users, the purpose of the materials, medical physicist, possession limits, precautionary measures, transport rules, correspondance
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How long is a license good for?
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5 years
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Upon application or reapplication of the license, a licensee may also have to submit procedures or statements about which procedures?
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Calibrating survey meters and dose calibrator, external monitoring program, RSC, leak testing of sealed sources, safe use of RAM, clean-up of spills, reciving packages, opening RAM packages, multi dose vial use, moly concen, area surveys, waste disposal
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What dose a new license/annual fee cost for: Hospital (specific medical) Hospital (broad scope med) Nuc Power Plant
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4900 29000 5 mil
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When must a licensee apply for an amendment to the license?
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1) before it receives, prepares, or uses byproduct material for a kind of use that is permitted under part 35 but isn't authorized by the license's current conditions 2) Before it permits anyone to work as an authorized user under the license (unless the person meets qualification requirements given in the rules and has been approved by the RSC) 3) Before it changes RSO 4) Before it orders byproduct material in excess of the allowed amount 5) Before it changes the areas of use identified in the license 6) Before revising procedures regarding therapy safety
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35.14 Notifications
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A 30 day notice must be given to the NRC if a licensee adds an authorized user, physicist, nuc pharmacist, or if one of the above d/c duties, address changes, name change, if licensee adds/changes areas of use specified in 35.100 or 35.200
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According to 35.24, a licensee's management must approve in writing of what 3 things?
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1) license amendments and requests 2)new authorized users, med physicists 3) radiation protection program changes that don't require an amendment
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According to 35.24, a licensee must appoint an RSO who agrees in writing to be responsible for implementing the radiation safety program and must meet the following qualifications:
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1) Meet qualifications given in 35.50 2)Can't also be an authorized user except for pd of no more than 60 days 3) Identify problems, provide corrective action, stop unsafe operations, verify corrective action implementations
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According to 35.24, a licensee must establish a radiation safety committee if the the licensee is authorized for 2+ different types of byproduct material use and the committee must include:
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An authorized user of each type of use RSO Rep of nursing service Rep of management who isn't use or AU
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35.27 Supervision
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Outlines controls in place for proper supervision of RAM Users
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Define written directive
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An authorized user's written order for the administration of byproduct material or radiation from byproduct material to a specific pt or human research subject as specified in 35.40
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According to 35.40, a written directive must be signed & dated by an AU before what?
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1)Administration of I-131 NaI greater than 1.11 MBq (30uCi) 2)any therapeutic dosage of unsealed byproduct material or any therapeutic dose of radiation from byproduct material
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If a patient's condition requires immediate treatment, a verbal order is acceptable, providing that what?
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A written directive is prepared within 48 hours after tx
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For I-131 therapies, the written directive must include what?
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Pt name, dose
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For other RP therapies (samarium, strontium, zevalin) the written directive must include what?
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Pt name dose route of administration
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According to 35.41, the licensee must develop procedures that provide high confidence that:
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The pt identity is verified before each administration Each administration follows the written directive Verifies agreement with computer generated tx plan
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What do 35.50-59 cover?
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Training requirements
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Subpart C (General technical requirements) of 35.60 talk about possession use and calibration of instruments used to measure activity of what?
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Unsealed byproduct material
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When must a dose calibrator be calibrated?
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Before first medical use According to manufacturers instructions or nationally recognized standards
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35.61 Calibration of survey instruments
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Survey meters must be calibrated before first use, annually, and after repair Cn/b used if the difference between indicated exposure rate and calculated exposure rate is greater than 20%
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35.63 Determination of Dosages of Unsealed Byproduct Material for Medical Use
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1) Licensee must determine & record activity of doses prior to use 2) Dose determination can be a combination of direct measurement, volumetric measurements, and math calculations 3) Can't use dose that differs from the expected dose by >20%
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35.65 Authorization for Calibration, Transmission, and Reference sources
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Allows licensees to possess sealed sources for daily calibration, instrument checks, and no source can be greater than 30 mCi except for tech which can be as much as you need
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35.67 Requirements to Possession of Sealed Sources and Brachytherapy sources
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1)Licensees who possess sealed sources must follow safety instructions by manufacturer 2) test source for leakage every 6 mo 3) conduct semi-annual inventory
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35.69 Labeling of Vials and syringes
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Syringes and vials must be labeled to identify the RAM and/or drug
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35.70 Surveys of ambient radiation exposure rate
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at the end of each day of use, licensee must survey with a survey meter anywhere unsealed byproduct material was prepared for use or administered
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35.75 Release of Individuals Containing Unsealed Byproduct Material or Implants Containing Byproduct Material
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1) Licensee may release an pt who has unsealed byproduct material/implants if the total effective dose equivalent to any other individual from exposure to this person won't exceed 5 mSv (500 mrem) 2) Licensee must provide the released individual with instructions to maintain ALARA if the total effective dose to another individual is likely to exceed 1 mSv (100 mrem) 3)Must keep record of the justification of release of patients
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35.92 Decay in storage
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Byproduct material can be held with a half life of less than 120 days for decay in storage and may be disposed of when it measures background and when the radiation labels are 0bliterated
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35.100 Use of unsealed byproduct material for uptake, dilution, and excretion studies for which a written directive isn't required
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Byproduct material can be used for uptake, dilution, and excretion studies if the material is provided by a licensed manufacturer, ANP, or NRC research facility
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35.190 Training for Uptake, Dilution, and Excretion studies
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Training requirements for authorized users who wish to perform 35.100 studies
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35.200 Use of unsealed byproduct material for imaging and localization studies for which a written directive isn't required
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Unsealed byproduct material for imaging and localization can be used if the material is from a licensed manufacturer, ANP or NRC facility
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35.204 Permissible moly concentration
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Can't exceed 0.15 uCi Mo/1 mCi tech before administering to pt
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35.290 Training for imaging and localization studies
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Education and training experience for a physician who wishes to be listed as an AU on the license to perform imaging and localization studies with RP's covered by section 35.200
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35.300 Use of unsealed byproduct material for which a written directive is required
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Unsealed byproduct material c/b used for diagnostic or therapeutic studies if the material is from a licensed manufacturer, ANP, or NRC facility
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35.310 Safety Instruction
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Radiation safety s/b provided initially and at least annually to all ppl caring for patients that have received quantities of byproduct material that requires a written directive
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35.310-Describe the topics that the safety training must cover
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Patient control (restrictions) Visitor control (restrictions) Contamination control Waste control Notification of RSO if emergency or patient dies
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35.315- Safety Precautions
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If a patient receiving byproduct material requiring a written directive can't be released: Patient must be quartered in private room Visibly post "Caution: RAM" sign Note the visitation restrictions on the door monitor material removed from pt room or handle the material as radioactive waste Notify RSO if pt dies or emergency
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35.390 Training for use of unsealed byproduct material for which a written directive is required
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Education and training requirements for physician who wishes to be AU on license to order, use and administer RP's covered by 35.300 (training requirements are heightened for this user)
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35.932 Training for Tx of Hyperthyroidism
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Direct supervision of at least 10 cases
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35.934 Training for Tx of Thyroid Carcinoma
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Direct supervision of at least 3 cases
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Medical Event
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An even that results in a dose that differs from the prescribed dose by more than 5 rem effective dose equivalent, 50 rem to an organ or tissue, or 50 rem shallow dose equivalent to the skin, AND: the delivered dose differs by 20%, or the fractionated dose delviered differs from the prescribed, for a single fraction, by >50%
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Medical Event (contd)
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A dose that exceeds 5 rem effective dose equivalent, 50 rem to organ/tissue, 50 rem shallow dose equivalent to the skin for any reason: Wrong radioactive drug administered, wrong route of administration, administration of dose to wrong individual, administration delivered by wrong mode of tx, leaking sealed source
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Medical Event (contd)
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Dose to skin or organ or tissue other than tx site that exceeds 50 rem to organ or tissue and >50% of the dose expected from the administration defined in the written directive
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When must a licensee report a medical event to the NRC?
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No later than the next calendar day after discovery and by written report within 15 days of discovery Licensee must notify the individual and his/her referring physician within 24 hours after discovery