Question

A. Put (√) or (ᵡ) and correct the wrong statement:

1. The external radiation source divided to the natural and artificial sources of radiation.
……………………………………………………………………………………….
2. The radon is a radioactive gas.
……………………………………………………………………………………….
3. Therapeutic is a kind of the natural external radiation source.
……………………………………………………………………………………….
4. The film badges contain slow and fast emulsion.
……………………………………………………………………………………….
5. The thermo luminescent dosimeter contains non – metallic mineralized material such as LiF or CaF.

Answer 1

Ans:

1. True

The external radiation source can be from natural and artificial sources. Natural source include radionuclides in the earth and cosmic rays etc. Artificial sources include minerals in crushed rock, building materials, and phosphate fertilizers etc..

2. True

3. False

Cosmic rays is a kind of the natural external radiation source.

4. True

In film badges, one side is coated with a large grain, fast emulsion that is sensitive to low levels of exposure. The other side of the film is coated with a fine grain, slow emulsion that is less sensitive to exposure.

5. True

The thermo luminescent dosimeter contains non – metallic mineralized material such as LiF or CaF. These materials are thermoluminescent crystalline materials.