Chapter 18 review questions/summary/additional info CRB

Activity is defined as:

The source of ionizing radiation that contributes the most to exposure of the general population in the US is:

Which type of device is best suited for output measurements of radiation therapy equipment?

Stochastic, or non threshold, effects of radiation exposure do not include:
A. cancer induction
B. genetic effects
C. cataract formation
D. birth defects

Exposure of which people would contribute the most of the genetically significant dose?
A. all contribute equally
B. 70 yr old man
C. 20 yr old woman
D. 50 yr old woman

The annual effective dose equivalent limit for radiation wokers is:

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?

Energy absorbed per unit mass

Ionization per unit mass of air by photons

Short-range, relatively heavy-mass, high-LET particle

What are the 2 major sources of radiation exposure in the radiation therapy dept?

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.

In keeping with the _____ concept, every means should be taken to reduce individual exposure.

Practical radiation protection from external beam radiation should include the time-honored methods of:

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 ____.

Safety equipment must be tested ____ to ensure that it operates properly when needed.

What are the fundamental techniques for radiation protection?

Which dosimeters have largely replaced film badge dosimeters for personnel monitoring?

The overall risk of exposure to radiation is approximately ____ in _____ persons per rem.

What are the most common types of ionizing radiation used in radiation therapy? (3)

NCRP Recommendation:
Occupational exposures (annual) for:
-Effective dose equivalent limit (stochastic effects)

NCRP Recommendation:Occupational exposures (annual) for:
Dose equivalent limits for tissues and organs (non stochastic effects)
-Lens of eye
-All others (breast, lung, gonads, skin, extremities)

NCRP Recommendation:Occupational exposures (annual) for:
-Guidence: cumulative exposure

NCRP Recommendation: Public exposures (annual) for:
-Effective dose equivalent limit, continuous or frequent exposure
-Effective dose equivalent limit, infrequent exposure

NCRP Recommendation: Embryo-fetus exposures for:
-Total dose equivalent limit
-Dose equivalent in a month

Number of patients per week x amount of radiation for each:

Fraction of time the beam is aimed at a particular wall:

Fraction of time area will be occupied:

Distance from the source of radiation to occupied area:

Limit for occupied area; radiation worker equivalent limit or general public:

As expected, the less _____ one is exposed to radiation, the less dose is acquired

Increasing the ___ from a source of radiation can drestically reduce the radiation exposure.