NRRPT Radiological Protection Standards 5

Question 1

In 10 CFR Part 835, the dose limit for the lens of the eye for DOE workers is:

Accepted Answer

15 rem/year

Answer

10 CFR 835.202 sets the annual occupational dose limit for the lens of the eye at 15 rem (150 mSv) for DOE workers, consistent with NRC limits.

Question 2

NCRP Report No. 151 deals specifically with:

Accepted Answer

Structural shielding design for diagnostic X-ray facilities

Answer

NCRP Report No. 151 provides guidance on structural shielding design and evaluation for medical X-ray imaging facilities.

Question 3

The 'planned special exposure' (PSE) provision under 10 CFR 20.1201 allows a worker to receive up to an additional:

Accepted Answer

10 rem in a calendar year, lifetime limit of 25 rem from PSEs

Answer

Under 10 CFR 20.1201(c), a PSE may allow up to 10 rem in a calendar year and must not exceed 25 rem in a lifetime from such exposures.

Question 4

Which quantity is used to express the dose equivalent for regulatory compliance in the U.S. under 10 CFR Part 20?

Accepted Answer

Dose equivalent in rem or sievert

Answer

10 CFR Part 20 uses 'dose equivalent' expressed in rem (or sievert) which incorporates the quality factor, distinct from ICRP's 'equivalent dose' using radiation weighting factors.

Question 5

Under the Linear No-Threshold (LNT) model adopted by ICRP and NCRP, which statement is most accurate?

Accepted Answer

Risk is proportional to dose with no threshold, even at low doses

Answer

The LNT model assumes cancer risk is directly proportional to dose with no safe threshold, which forms the regulatory basis for radiation protection standards.

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Radiological Protection Standards 5