People who work around radioactivity wear film badges to monitor the amount of radiation that reaches their bodies. Each badge consists of a small piece of photo- graphic film enclosed in a lightproof wrapper. Whatkind of radiation do these devices monitor, and how can they determine the amount of radiation the people receive

The kind of radiation these devices monitor are the GAMMA RADIATION. how we can determine the amount of radiation the people receive is that the exposed areas INCREASE IN OPTICAL DENSITY.

Explanation:

Radiation is defined as the transmission energy through a material medium in the form of wave. It is divided into two categories: Ionising and non Ionising radiation.

Gamma ray is an example of Ionising radiation that consists of shortest electromagnetic wavelengths with high penetration effects. It is used for a variety of purpose such as ;

- sterilization of medical equipments

- removal of decay causing bacteria from food.

- for cancer treatment and

-In nuclear medicine for imaging techniques.

Although they are used for the above functions, they are biologically hazardous because of the high penetration power.

Therefore people who work around radioactivity wear film badges to monitor the amount of radiation that reaches their bodies.

b is the correct

1.solid

2.carbon dioxide

3.helium