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Thermoluminescent dosimeters (TLDs) are indeed personal radiation monitors that utilize materials such as lithium fluoride to detect ionizing radiation. When exposed to radiation, TLDs absorb energy and store it.

The reason the answer is that TLDs emit heat in response to stimulation by light is because TLDs actually release their stored energy as visible light when heated, rather than emitting heat itself. This process is called thermoluminescence, where the TLD is heated to release the absorbed radiation energy in the form of light, which is then measured to quantify the radiation exposure.

The other statements accurately describe characteristics of TLDs. They can be reused after being read and reset, they indeed use lithium fluoride phosphor as their sensing material, and they function as personal monitors that individuals (like medical staff or radiology technicians) carry to measure their exposure to radiation.