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The minimum source-to-tabletop distance permitted for stationary fluoroscopic units is:

EXTRA CREDIT: A cobalt-60 radiotherapy source, installed on January 1 of this year, had an initial activity of 6,000 Ci. Cobalt-60 has a radioactive half-life of 5.3 years. How much activity will remain after 21.2 years? Perform all calculations below. No credit given without calculations. Partial credit will be given for at least one correct answer.

There is a direct relationship between the amount of light detected when a TLD crystal is heated and the dose of ionizing radiation received.

The total filtration required for x-ray tubes operating above 70 kVp is:

Which of the following can help reduce the likelihood of repeat images owing to motion and other patient-related errors? 1- Effective communication 2- Proper application of immobilization 3- Shortest possible exposure time

Filtration in the x-ray tube is intended to reduce radiation dose to the skin caused by:

Which of the following exposure factors would produce the LOWEST patient dose, all other variables unchanged (e.g., field size, area of interest, SID, etc.)?

Which of the following provides a permanent record of occupational dose?

Radiation dose in CT does not depend on filtration.

A female patient of reproductive capacity is least likely to be pregnant within: