People who work around radioactivity wear film badges to monitor the amount of radiation that reaches their bodies. these badges consist of small pieces of photographic film enclosed in a light-proof wrapper. what kind of radiation do these devices monitor?

the kind of radiations of the devices monitor are gamma, X-Rays and beta particles.

Explanation:

Film badges, which is usually worn in the front body, is a device to monitor the exposure of the radiation. This device measures the the exposure of X-Rays, Gamma Rays and beta Particles. This device is able to differentiate the energy of photon and is considerably accurate for the exposure greater than 100 millirem. However, under 20 milllirem, the device is less accurate for gamma rays.