Which detector is based on ionization in a gas and is used to detect alpha, beta, and gamma radiation but cannot distinguish among them?

Which detector is based on ionization in a gas and is used to detect alpha, beta, and gamma radiation but cannot distinguish among them?

• A. Gaseous ionization detector
• B. Scintillation detector
• C. Semiconductor detector
• D. Cloud chamber

Answer: (A)

Gas-filled ionization detectors work by measuring the ionization created by radiation in a gas. They respond to alpha, beta, and gamma because all of these produce ion pairs in the gas, creating a detectable electrical signal. But they don’t provide a way to tell which type caused the signal. In many gas detectors, especially in Geiger-Mueller mode, each detected event produces a pulse of essentially the same shape and size, regardless of whether it’s alpha, beta, or gamma. That means you get a count of radiation events, not a differentiation of their type. Other detectors, like scintillation or semiconductor detectors, can offer energy information that helps identify the radiation, and cloud chambers show tracks that reveal the particle type, but the gas-filled ionization detector focuses on detecting ionization events without distinguishing the radiation type.

Gas-filled ionization detectors work by measuring the ionization created by radiation in a gas. They respond to alpha, beta, and gamma because all of these produce ion pairs in the gas, creating a detectable electrical signal. But they don’t provide a way to tell which type caused the signal. In many gas detectors, especially in Geiger-Mueller mode, each detected event produces a pulse of essentially the same shape and size, regardless of whether it’s alpha, beta, or gamma. That means you get a count of radiation events, not a differentiation of their type. Other detectors, like scintillation or semiconductor detectors, can offer energy information that helps identify the radiation, and cloud chambers show tracks that reveal the particle type, but the gas-filled ionization detector focuses on detecting ionization events without distinguishing the radiation type.