Radiation Safety & Regulations Flashcards

What is the annual occupational effective dose limit for radiation workers in the US?

Answer: 5 rem (50 mSv)

The NRC sets the annual occupational effective dose limit at 5 rem (50 mSv) per year for radiation workers.

Which principle of radiation protection involves maximizing distance from the source?

Answer: Distance

Distance is one of the three cardinal principles of radiation protection; doubling distance reduces exposure by a factor of four (inverse square law).

A radiation survey meter reads 5 mR/hr at 1 meter from a source. What is the approximate dose rate at 2 meters?

Answer: 1.25 mR/hr

By the inverse square law, doubling the distance reduces dose rate by a factor of 4, so 5 ÷ 4 = 1.25 mR/hr.

Which document establishes radiation protection standards for NRC-licensed facilities?

Answer: 10 CFR Part 20

10 CFR Part 20 (Standards for Protection Against Radiation) is the NRC regulation governing occupational and public radiation exposure.

What type of dosimeter provides a continuous, real-time readout of accumulated radiation dose?

Answer: Electronic personal dosimeter (EPD)

Electronic personal dosimeters (EPDs) provide real-time digital readout of accumulated dose and dose rate, unlike passive dosimeters.

Which radioactive waste classification applies to most low-level radioactive waste generated in nuclear medicine?

Answer: Class A

Most nuclear medicine waste (short half-life isotopes at low concentrations) is classified as Class A low-level radioactive waste, the least restrictive category.

What is the NRC-mandated lens of the eye annual dose equivalent limit for occupational workers?

Answer: 15 rem (150 mSv)

The NRC sets the occupational lens of the eye dose equivalent limit at 15 rem (150 mSv) per year under 10 CFR 20.1201.