Radiation Detection | MCQs

Explanation

Antoine Henri Becquerel was an engineer, physicist, Nobel laureate,

First person to discover evidence of radioactivity.

 He belonged to France.

Explanation

1 becquerel = 1 radioactive decay per second = 2.703x10^-11 Ci.

Explanation

The dead time of a GM counter is the brief period (about 10⁻⁴ seconds) after detecting a particle during which it can't detect another.

This happens because the detector needs time to reset.

It limits how fast the counter can measure radiation.

Explanation

Gamma-ray cameras can observe radiations from the radioisotopes that are concentrated in the organs.

In medical imaging, radioisotopes are often used in nuclear medicine to diagnose and treat various conditions.

These isotopes emit gamma rays as they decay, and the gamma-ray camera detects these rays to create images of the organs where the isotopes have accumulated.

Explanation

The scintillation nuclear radiation detector detects the alpha rays per second. When the energy of the alpha rays (Eα) in MeV increases, the number of counts (Nc) on the detector also increases linearly as shown in the table below. 

Draw the graph of Nc as a function of Eα (MeV) and find the energy of the unknown alpha ray if the number of counts is 31600.