Radiation Health and Safety Test Radiation Protection & Shielding Flashcards
6 cards from real Radiation Health and Safety Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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What type of radiation survey instrument is best suited for detecting low-level alpha contamination on surfaces?
Answer: Geiger-Müller probe with thin mica window
A GM probe with a thin mica end-window allows the weakly penetrating alpha particles to enter and ionize the gas inside the tube, enabling surface contamination detection.
Which NRC regulation governs occupational radiation protection standards for workers in licensed nuclear facilities?
Answer: 10 CFR Part 20
10 CFR Part 20 (Standards for Protection Against Radiation) establishes the NRC's radiation protection standards, including dose limits for workers and the public.
What is the purpose of a controlled area designation in a radiation facility?
Answer: To restrict access to only those trained to work with radiation and manage doses
A controlled area is restricted to individuals who are aware of radiation risks, can be monitored, and whose occupational doses are managed in accordance with ALARA principles.
What shielding approach is used in a fluoroscopy suite's protective apron primarily to protect against?
Answer: Scattered radiation from the patient
Lead aprons are worn by fluoroscopy personnel to protect against scattered radiation emanating from the patient, which is the primary source of exposure to the radiologist and technologist.
What is the function of a bioassay in internal radiation dosimetry?
Answer: To determine the amount of radioactive material inside a person's body
Bioassay involves analyzing body fluids, excreta, or performing in-vivo measurements to estimate the quantity and distribution of radionuclides inside the body.
When decontaminating skin that has been contaminated with radioactive material, what is the recommended first step?
Answer: Wash thoroughly with soap and lukewarm water, avoiding skin abrasion
Gentle washing with soap and lukewarm water is the first and most effective step for skin decontamination, as it removes most surface contamination without damaging the skin barrier.