Answer :
Final answer:
The types of gas-filled detectors are Proportional counter, G.M. counter, and Ionization chamber. A Semi-conductor detector is not a gas-filled detector, rather it operates based on the interaction of radiation with a semi-conductive material.
Explanation:
In the context of radiation detection, the options given indicate different types of detectors. A Proportional counter, G.M. counter (Geiger-Muller counter), and an Ionization chamber are types of detectors that work on the principle of gaseous ionization and hence are gas-filled detectors. However, a Semi-conductor detector is not a gas-filled detector. It operates on a different principle where the incident radiation interacts with a semi-conductive material causing the generation of electron-hole pairs which creates a detectable signal.
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