Final answer:
TLD personnel monitoring disadvantages include potential data loss from heat and moisture, higher costs when read monthly, and decreased sensitivity compared to film badges.
Step-by-step explanation:
The use of Thermoluminescent Dosimeters (TLDs) for personnel monitoring comes with certain disadvantages compared to other dosimetry methods such as film badges. The first disadvantage is that TLDs can lose information when exposed to heat and moisture, which can be a concern in certain work environments. Secondly, TLDs can be more costly compared to film badges, particularly when readings are taken monthly, which can be a financial burden for some institutions. Lastly, TLDs have been found to have a decreased sensitivity compared to film badges, meaning they may not be as effective in measuring low levels of radiation.