The source of ionizing radiation that contributes the most to exposure of the general population in the US is:
natural background radiation
Which type of device is best suited for output measurements of radiation therapy equipment?
ionization chamber
Stochastic, or non threshold, effects of radiation exposure do not include:
C. cataract formation
Exposure of which people would contribute the most of the genetically significant dose?
C. 20 year old woman
The annual effective dose equivalent limit for radiation wokers is:
50 mSv
A G-M detector is 2 m from a small brachytherapy source and measures an exposure rate of 10 mR/hr. What exposure would you expect to measure if the detector were moved to 4 m from the source?
Regardless of which models are used to estimate the risks of radiation exposure, it is universally agreed that the less radiation received, the ____ the risk.
lower
In keeping with the _____ concept, every means should be taken to reduce individual exposure.
ALARA
Practical radiation protection from external beam radiation should include the time-honored methods of:
time
distance
shielding
A resurgence in the use of ________ sources requires the radiation therapy practitioner to be prepared to demonstrate a comprehensive knowledge of its uses in terms of radiation ____ and ____.
brachytherapy
safety
protection
Safety equipment must be tested ____ to ensure that it operates properly when needed.
frequently
What are the fundamental techniques for radiation protection?
time
distance
shielding
Which dosimeters have largely replaced film badge dosimeters for personnel monitoring?
OSL
Optically Stimulated Luminescence
The overall risk of exposure to radiation is approximately ____ in _____ persons per rem.
7 in 10,000
What are the most common types of ionizing radiation used in radiation therapy? (3)