NRRPT Dosimetry and Exposure Control 3

Question 1

The shallow dose equivalent (SDE) measures dose at a tissue depth of:

Accepted Answer

0.007 cm (70 micrometers)

Answer

The shallow dose equivalent is measured at a tissue depth of 0.007 cm (70 μm), representing the dose to the skin and extremities.

Question 2

A photon dose rate of 2.5 mGy/hr has a radiation weighting factor of 1. What is the equivalent dose rate in mSv/hr?

Accepted Answer

2.5 mSv/hr

Answer

For photons, the radiation weighting factor (wR) is 1, so equivalent dose (mSv) = absorbed dose (mGy) × 1 = 2.5 mSv/hr.

Question 3

Which type of dosimeter provides an immediate reading of accumulated dose and can be reset after each use?

Accepted Answer

Self-reading pocket dosimeter

Answer

Self-reading (direct-reading) pocket dosimeters display accumulated dose immediately and can be zeroed and reused after each shift.

Question 4

The NRC requires that personnel dosimetry be provided to radiation workers whose dose in any calendar year is likely to exceed what fraction of the occupational limit?

Accepted Answer

1/10 (10%)

Answer

10 CFR 20.1502 requires dosimetry for workers likely to receive more than 10% (1/10) of the applicable annual dose limit.

Question 5

What is the purpose of using a control dosimeter (control badge) in a personnel dosimetry program?

Accepted Answer

To establish background radiation levels and detect processing artifacts

Answer

Control dosimeters are kept in an unoccupied, low-radiation area to account for background and any processing-related response so it can be subtracted from worker readings.

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Dosimetry and Exposure Control 3