Question

Which type of rays are commonly used in radiation level detector?

• A. Gamma rays
• B. Beta rays
• C. Nuclear radiation
• D. Alpha rays

Hint:

Radiation Level Gauges. Utilize the attenuation of radiation by the material being measured. Gamma rays are typically used due to their ability to penetrate vessel walls and process materials.

Answer 1

The Correct Option is A

Radiation-based level detectors work by placing a radioactive source on one side of a vessel and a detector on the other
The material inside the vessel absorbs or scatters the radiation, reducing the intensity reaching the detector
The detected intensity is thus related to the level of material in the vessel
For this technique to work effectively, especially with industrial vessels that have thick walls, the radiation must have sufficient penetrating power
- Alpha rays have very low penetration (stopped by paper or skin)
- Beta rays have moderate penetration (stopped by a few mm of metal)
- Gamma rays are highly penetrating electromagnetic radiation (requires thick lead or concrete for shielding)
Because of their high penetrating power, gamma rays are most commonly used in industrial radiation level gauges, as they can pass through the vessel walls and the material inside to reach the detector
"Nuclear radiation" is too general a term