RSO Dosimetry and Personal Exposure Assessment

Question 1

A thermoluminescent dosimeter (TLD) measures radiation exposure by:

Accepted Answer

Storing energy in crystal lattice defects released as light when heated

Answer

Ionizing gas in a sealed chamber

Answer

Darkening photographic film proportional to dose

Answer

Counting individual photon interactions electronically

Question 2

The NRC annual occupational whole-body dose limit (TEDE) for radiation workers is:

Accepted Answer

50 mSv (5 rem)

Answer

5 mSv (0.5 rem)

Answer

100 mSv (10 rem)

Answer

20 mSv (2 rem)

Question 3

An optically stimulated luminescence (OSL) dosimeter differs from a TLD primarily because it:

Accepted Answer

Releases stored dose information using light rather than heat

Answer

Requires no reader and gives a direct digital display

Answer

Only measures neutron dose

Answer

Cannot be reread after initial processing

Question 4

When should a radiation worker wear their dosimeter at the collar level rather than at the waist?

Accepted Answer

When wearing a lead apron in fluoroscopy or other high-dose-rate x-ray environments

Answer

When working with pure beta emitters only

Answer

When monitoring for neutron dose

Answer

When the whole-body dose is expected to exceed 50 mSv

Question 5

A deep dose equivalent (DDE) reported on a dosimeter badge refers to dose at a tissue depth of:

Accepted Answer

1.0 cm for deep tissue/organs

Answer

0.007 cm (70 µm) for skin

Answer

0.3 cm for lens of eye

Answer

5.0 cm for bone marrow

Question 6

A Geiger-Müller (GM) survey meter is best suited for:

Accepted Answer

Detecting the presence of low-level beta/gamma contamination

Answer

Accurately measuring high dose rates above 1 Gy/h

Answer

Measuring neutron fluence rates

Answer

Quantifying alpha emitters through intact clothing