Which device can read doses as low as 50 μGya?

Which device can read doses as low as 50 μGya?

• A. Handheld ionization chamber
• B. TLD
• C. Pocket ionization chamber
• D. Film badge

Answer: (B)

High-sensitivity dose measurement requires a dosimeter that can detect tiny energy deposits in the detector material. Thermoluminescent dosimeters trap energy when exposed and later release light when heated; the light output is proportional to the absorbed dose, giving precise readings even at very low exposures. This makes them capable of reading doses around 50 μGy in air. In contrast, handheld or pocket ionization chambers are designed for real-time dose-rate monitoring and generally require higher accumulated doses to produce precise readings; their signals can be less reliable at very low total exposures. Film badges can measure dose as well, but their sensitivity is lower and their readings rely on processing and calibration, which can obscure very small doses like 50 μGy. So, the thermoluminescent dosimeter is the best choice for detecting such a low dose because of its superior sensitivity at the μGy level.

High-sensitivity dose measurement requires a dosimeter that can detect tiny energy deposits in the detector material. Thermoluminescent dosimeters trap energy when exposed and later release light when heated; the light output is proportional to the absorbed dose, giving precise readings even at very low exposures. This makes them capable of reading doses around 50 μGy in air.

In contrast, handheld or pocket ionization chambers are designed for real-time dose-rate monitoring and generally require higher accumulated doses to produce precise readings; their signals can be less reliable at very low total exposures. Film badges can measure dose as well, but their sensitivity is lower and their readings rely on processing and calibration, which can obscure very small doses like 50 μGy.

So, the thermoluminescent dosimeter is the best choice for detecting such a low dose because of its superior sensitivity at the μGy level.