CRI Safety Standards & Quality Control 3

Question 1

What is the maximum permissible occupational radiation dose to the whole body per year under 10 CFR Part 20?

Accepted Answer

5 rem (50 mSv)

Answer

10 CFR 20.1201 limits occupational whole-body dose to 5 rem (50 mSv) per year for radiation workers.

Question 2

Film darkroom safelights used during radiographic film processing must be verified using a:

Accepted Answer

Coin or paper fog test

Answer

The coin or paper fog test checks whether safelight conditions cause measurable fog on unexposed film, ensuring darkroom integrity.

Question 3

Which type of radiation is most effectively shielded by lead and dense concrete?

Accepted Answer

Gamma rays

Answer

Gamma rays require dense shielding materials like lead or thick concrete because of their high penetrating power and electromagnetic nature.

Question 4

The 'inverse square law' states that radiation intensity is inversely proportional to:

Accepted Answer

The square of the distance from the source

Answer

Radiation intensity decreases with the square of the distance: doubling the distance reduces intensity to one-quarter of its original value.

Question 5

During radiographic operations in a restricted area, the radiation level at the boundary must not exceed:

Accepted Answer

2 mR in any one hour

Answer

10 CFR 34.43(a) requires that the dose rate at the boundary of the restricted area not exceed 2 mR in any one hour for areas where individuals may receive more than 5 rem/year.

(CRI) Certified Radiographic Interpreter Practice Test

(CRI) Certified Radiographic Interpreter Practice Test

CRI Safety Standards & Quality Control 3