Radiation detection and measurements

Question 1

How does a Gas Filled Ionization Chamber work?

Answer 1

A gas-filled ionization chamber detects radiation by measuring the electric current produced when ionizing radiation passes through a gas within the chamber. The gas is ionized, creating ion pairs, and an electric field between two electrodes within the chamber causes these ion pairs to separate and drift towards the oppositely charged electrodes. The resulting electric current is proportional to the intensity of the radiation

Question 2

Which of the following radionuclides cannot be detected by gamma spectrometry pulse height analysis?

A. Hydrogen-3
B. Iodine-131
C. Cerium-144
D. Ruthenium-106
E. Cesium-137

Answer 2

A Hydrogen-3 and D. Ruthenium-106

Both of these isotopes are pure beta emitters but the daughter product Rhodium-106 emits gamma rays.

Question 3

Which of the following radionuclides is most suited to in-vivo measurements?

A. Hydrogen-3
B. Carbon-14
C. Strontium-90
D. Iodine-131
E. Plutonium-239

Answer 3

D. Iodine-131

In-vivo means detection from within a body