ASNT Industrial Radiography Radiation Safety Practice Test

Why are alpha and beta particles of little concern in modern radiography?

1. They are rarely encountered in the field.

2. They travel at sub-light speeds and are easily shielded.

3. They have no charge and are inert.

4. They are absorbed by the human body.

The correct answer is: They travel at sub-light speeds and are easily shielded.

Alpha and beta particles are of little concern in modern radiography primarily because they travel at sub-light speeds and can be effectively shielded. Alpha particles, which consist of two protons and two neutrons, have a relatively low penetration ability and can be stopped by just a sheet of paper or the outer layer of human skin. Beta particles, which are high-energy, high-speed electrons or positrons, are also relatively easy to shield against; materials like plastic, glass, or aluminum can stop them. This effective shielding capability makes the risk associated with alpha and beta radiation much lower in practical terms for those working in radiography. The technology and materials used in radiographic applications are primarily designed to manage gamma radiation which has higher penetration power and poses more significant risks when considering radiation safety. Thus, while alpha and beta radiation can be hazardous under certain conditions, they are generally deemed less of a concern due to their low penetration and the effectiveness of available shielding techniques.