NRRPT CABT Healthcare Safety Standards & Regulations 5 — Questions and Answers
Question 1: A nuclear medicine technologist administers a diagnostic radiopharmaceutical to the wrong patient. Under 10 CFR 35.3045, this is reportable if the administered dosage differs from the prescribed dosage by more than:
- 5% of the prescribed dosage
- 10% of the prescribed dosage
- 20% of the prescribed dosage (Correct answer)
- 50% of the prescribed dosage
Correct answer: 20% of the prescribed dosage
A medical event in diagnostic nuclear medicine is triggered when the administered dosage differs from the prescribed dosage by more than 20% per 10 CFR 35.3045 criteria.
Question 2: What type of shielding requirement typically applies to rooms where x-ray fluoroscopy is permanently installed in a US hospital?
- Shielding designed to maintain doses below 1 mSv/week for controlled areas and 0.02 mSv/week for uncontrolled areas (Correct answer)
- No regulatory shielding requirement; shielding is at the institution's discretion
- Shielding adequate to reduce doses to zero in adjacent areas
- Shielding designed to achieve doses at or below 5 mSv/week in all areas
Correct answer: Shielding designed to maintain doses below 1 mSv/week for controlled areas and 0.02 mSv/week for uncontrolled areas
NCRP Report No. 147 and state/NRC regulations require shielding designs that maintain weekly doses below 1 mSv for controlled areas (radiation workers) and 0.02 mSv for uncontrolled areas (public).
Question 3: What is the NRC's requirement for 'declared pregnant workers' in terms of fetal dose monitoring?
- A separate deep-dose badge worn at the abdomen is required to estimate fetal dose (Correct answer)
- No additional monitoring is required beyond standard whole-body dosimetry
- The worker must undergo monthly blood counts to detect radiation effects
- The employer must obtain a written waiver from the worker's obstetrician
Correct answer: A separate deep-dose badge worn at the abdomen is required to estimate fetal dose
Facilities typically issue a second dosimeter to be worn at the abdomen to estimate fetal dose throughout the declared pregnancy in compliance with 10 CFR 20.1208.
Question 4: The concept of 'controlled area' vs. 'uncontrolled area' in a hospital radiation facility primarily affects which regulatory requirement?
- The frequency of equipment maintenance inspections
- The applicable dose limits and shielding design goals for those spaces (Correct answer)
- Whether staff in those areas must be licensed by the NRC
- The type of radiation detection equipment that must be used
Correct answer: The applicable dose limits and shielding design goals for those spaces
Controlled areas are occupied by radiation workers with dose limits of 50 mSv/year; uncontrolled areas are occupied by the public with a limit of 1 mSv/year, directly driving shielding design.
Question 5: Under Joint Commission standards, when a healthcare facility identifies a radiation safety near-miss event, what is the expected organizational response?
- File a voluntary report with the NRC and move on
- Conduct a proactive risk assessment and implement corrective actions to prevent recurrence (Correct answer)
- Suspend radiation services until the next accreditation survey
- Report the event only if a patient's dose exceeded the prescribed amount
Correct answer: Conduct a proactive risk assessment and implement corrective actions to prevent recurrence
The Joint Commission expects healthcare organizations to analyze near-miss events using proactive risk assessment methods (such as FMEA) and implement corrective actions to prevent future occurrences.
Question 6: Which 10 CFR Part 20 section governs the concentration limits for releasing radioactive effluents into sanitary sewerage systems from hospital nuclear medicine departments?
- 10 CFR 20.1301
- 10 CFR 20.2003 (Correct answer)
- 10 CFR 20.1501
- 10 CFR 20.1801
Correct answer: 10 CFR 20.2003
10 CFR 20.2003 establishes the conditions and concentration limits under which licensed radioactive material may be released into sanitary sewerage systems.
Question 7: A healthcare facility wants to release a patient treated with iodine-131 for thyroid cancer. Which regulatory guidance most directly governs when the patient may be released based on radiation exposure to members of the public?
- 10 CFR 35.75 — release of individuals containing unsealed byproduct material (Correct answer)
- 10 CFR 20.1301 — dose limits for individual members of the public
- 10 CFR 35.3045 — medical event reporting requirements
- NCRP Report No. 155 — management of persons accidentally contaminated
Correct answer: 10 CFR 35.75 — release of individuals containing unsealed byproduct material
10 CFR 35.75 specifically authorizes release of patients administered radiopharmaceuticals when the total effective dose equivalent to any other individual is unlikely to exceed 5 mSv.
NRRPT CABT Healthcare Safety Standards & Regulations 5
A nuclear medicine technologist administers a diagnostic radiopharmaceutical to the wrong patient.
Under 10 CFR 35.3045, this is reportable if the administered dosage differs from the prescribed dosage by more than: