Question

In Radiometric survey, the g-ray spectrometer count rate depends on:

• A. Cracks present in the target rock volume
• B. Solid angle of the target rock about the spectrometer
• C. Temperature in the target rock
• D. Pressure in the target rock

Hint:

The solid angle in a gamma-ray spectrometer is crucial for the sensitivity of measurements in radiometric surveys.

Answer 1

The Correct Option is B

In Radiometric surveys, the gamma-ray spectrometer count rate is primarily influenced by the solid angle of the target rock around the spectrometer (Option B). The solid angle is essentially the angle subtended by the target rock volume at the spectrometer detector, which affects the detection efficiency of the emitted gamma rays. A larger solid angle typically results in a higher detection count.
[6pt] - Cracks in the target rock (A) may affect the distribution of radioactive material, but they do not significantly impact the spectrometer count rate.
- Temperature (C) and pressure (D) in the target rock can influence the physical properties of the rock but have less of an effect on the gamma-ray count rate in a radiometric survey.
Thus, the correct answer is (B): Solid angle of the target rock about the spectrometer.