Has the lowest penetrating power. Can only penetrate 0.05 mm into the body and can be stopped by a piece of paper or clothing. Gamma Alpha Beta

## Step 1<br />The problem is asking us to identify the type of radiation that has the lowest penetrating power. The options given are Gamma, Alpha, and Beta.<br /><br />## Step 2<br />Alpha particles are the least penetrating of the three types of radiation. They can be stopped by a piece of paper or clothing and can only penetrate about 0.05 mm into the body.<br /><br />## Step 3<br />Gamma and Beta particles, on the other hand, have higher penetrating power and can penetrate deeper into the body.