Dosimeters are typically worn on the outside of clothing, a "whole body" dosimeter is worn on the chest or torso to represent dose to the whole body. This location monitors exposure of most vital organs and represents the bulk of body mass.

Why does radiation make a clicking noise?

When the ionizing radiation passes through the gas inside the G-M tube, it knocks electrons off the gas atoms inside. ... And as they do, they knock electrons off other atoms, in what's called a Townsend avalanche.

What is the radiation clicking sound?

The number of clicks indicates how much radiation is entering the Geiger counter chamber. You hear a clicking sound as soon as you turn on the speaker because there is always some radiation in the background.