Ionization chambers are used to?

Ionization chambers are used to?

• A. Detecting changes in temperature
• B. Collect and measure the electric charge of electrons and positive ions produced by radiation in a fixed volume of gas
• C. Measure light output from scintillation
• D. Detect beta decay by counting background radiation

Answer: (B)

Ionization chambers detect radiation by collecting the electric charges produced when the radiation ionizes the gas inside a fixed volume. An electric field pulls the liberated electrons toward the anode and the positive ions toward the cathode, and the resulting current is proportional to the number of ion pairs created. That means the device measures the amount of radiation in that gas volume by reading the electric charge, which is why it’s used to monitor exposure or dose rate. It isn’t about sensing temperature, nor about measuring light from scintillation, and it isn’t primarily a tool for counting beta decays or background radiation with a GM counter.

Ionization chambers detect radiation by collecting the electric charges produced when the radiation ionizes the gas inside a fixed volume. An electric field pulls the liberated electrons toward the anode and the positive ions toward the cathode, and the resulting current is proportional to the number of ion pairs created. That means the device measures the amount of radiation in that gas volume by reading the electric charge, which is why it’s used to monitor exposure or dose rate. It isn’t about sensing temperature, nor about measuring light from scintillation, and it isn’t primarily a tool for counting beta decays or background radiation with a GM counter.