Geiger-Muller tube |Geiger Counter Lab Viva Questions and Answers
The Geiger-Mueller tube is the main part of the Geiger counter apparatus.
Prof. Hans Geiger, and Walther Müller invented the principle and develope the technique to measure the radiation in 1928.
The tube is in the shape of a cylinder about 1 cm in diameter and about 4 cm long.
Cesium-137 source
The main features of the source:
The half-life for the cesium-137 decay is 30.2 years
The source activity was 5 micro Curies when new (1 Curie = 3.7 x1010decays per second)
The energy of the emitted gamma rays is 661.6 KeV (1 KeV = 1 thousand electron-volts).
1Q. Cesium-137 decays into Barium or Uranium?
Ans: Barium
2Q. When Cesium-137 decays, which particles eject?Ans:
When Cesium-137 (Cs-137)decays, it emits beta particles (electrons) and gamma rays.
3Q.From which excited nucleus the Cesium-137 or Barium-137, photon emits?Ans:
Cs-137 → Ba-137m + e- + ν
Ba-137m → Ba-137 + γ
it is Ba-137m
4Q. Why should you clean the hand after performing the experiment?Ans:
During the experiment, the GM tube may come into contact with radioactive sources.
5Q. In which region the GM TUBE cannot distinguish between different type of radiations?Ans:
In the dead time region
6Q. A metal wire that is stretched at the axis of the cylinder (GM TUBE) is Anode or Cathode?Ans:
It is the anode
7Q. Does photoelectron initiate the second avalanche?Ans: Yes, photo-electrons can initiate the second avalanche in a Geiger-Müller (GM) tube.
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