Which may be used for 3 months at a time?

Which may be used for 3 months at a time?

• A. Geiger-Mueller detector
• B. TLD
• C. Film badge
• D. Pocket ionization chamber

Answer: (B)

The key idea is how different dosimeters are meant to be worn and read out over time. A thermoluminescent dosimeter is designed for quarterly monitoring; you wear it for about three months, then send it in to be read. It traps energy from radiation in crystal lattices during exposure, and later heating releases light in proportion to the absorbed dose—allowing a reliable, cumulative measurement that can be reused after annealing for the next cycle. In contrast, a Geiger-Mueller detector is an active instrument that gives real-time counts to indicate radiation presence or intensity, not a stored, cumulative dose over months. A pocket ionization chamber provides an immediate exposure-rate reading and isn’t used to track the total dose accumulated over a long period. Film badges can be used for varying intervals (often monthly or quarterly depending on policy) but aren’t as standardized for a strict three-month cycle as a TLD system is. So, for a three-month wear period, the thermoluminescent dosimeter is the best fit because it reliably captures and can be read out after a full quarter while remaining reusable for the next cycle.

The key idea is how different dosimeters are meant to be worn and read out over time. A thermoluminescent dosimeter is designed for quarterly monitoring; you wear it for about three months, then send it in to be read. It traps energy from radiation in crystal lattices during exposure, and later heating releases light in proportion to the absorbed dose—allowing a reliable, cumulative measurement that can be reused after annealing for the next cycle.

In contrast, a Geiger-Mueller detector is an active instrument that gives real-time counts to indicate radiation presence or intensity, not a stored, cumulative dose over months. A pocket ionization chamber provides an immediate exposure-rate reading and isn’t used to track the total dose accumulated over a long period. Film badges can be used for varying intervals (often monthly or quarterly depending on policy) but aren’t as standardized for a strict three-month cycle as a TLD system is.

So, for a three-month wear period, the thermoluminescent dosimeter is the best fit because it reliably captures and can be read out after a full quarter while remaining reusable for the next cycle.