Radiation Detectors Questions & Answers

1. Liquid samples must be counted using ionization chamber by placing them in which of the following?

a) Test tube

b) Curvette

c) Ampoules

d) Flask

Answer: Ampoules

2. Gaseous compounds containing radioactive sources can be directly introduced into the ionization chamber.

a) True

b) False

Answer: True

3. When X-ray enters the solid state detector it produces ion pair rather than electron-hole pair.

a) True

b) False

Answer: False

4. Which of the following is not a type of radiation detectors?

a) Geiger Muller counter

b) Proportional counter

c) Semiconductor detector

d) Flame emission detector

Answer: Flame emission detector

5. ‘When nuclear radiations pass through, gas ionization is produced.’ This is the principle of which of the following detectors?

a) Proportional counter

b) Flow counter

c) Geiger Muller counter

d) Scintillation counter

Answer: Geiger Muller counter

6. Which of the following acts as quenching gas in Geiger Muller counter?

a) Alcohol

b) Argon gas

c) Krypton

d) Hydrogen

Answer: Alcohol

7. Which of the following acts as ionising gas in Geiger Muller counter?

a) Alcohol

b) Argon gas

c) Krypton

d) Hydrogen

Answer: Argon gas

8. Which of the detectors is similar to Geiger Muller counter in construction but is filled with heavier gas?

a) Proportional counter

b) Flow counter

c) Semiconductor detector

d) Scintillation counter

Answer: Proportional counter

9. Which of the following is the main disadvantage of solid state semiconductor detector?

a) Low accuracy

b) Low sensitivity

c) It should be maintained at low temperature

d) High pressure has to be produced

Answer: It should be maintained at low temperature

10. Scintillation detector is a large flat crystal of which of the following materials?

a) Sodium chloride

b) Sodium iodide

c) Sodium sulphate

d) Sodium carbonate

Answer: Sodium chloride

11. Liquid Scintillators are used for which of the following materials?

a) Low energy beta materials

b) High energy beta materials

c) Low energy gamma materials

d) High energy gamma materials

Answer: Low energy beta materials

12. Which of the following gases are used in proportional counter as the ionising gas?

a) Alcohol

b) Argon gas

c) Krypton

d) Hydrogen

Answer: Krypton

13. Which of the following materials are used as the insulation between inner and outer electrodes of the ion chamber?

a) Polythene

b) Plastic

c) Polytetrafluoroethylene

d) Polyacrylamide