Which devices have the disadvantage of not providing a permanent record of radiation exposure?

The correct choice highlights that pocket ionization chambers and thermoluminescent dosimeters (TLD) do not provide a permanent record of radiation exposure.

Pocket ionization chambers rely on the ionization principle to measure radiation exposure. While they are highly sensitive and provide immediate readings, they typically do not record the exposure permanently. Users may have to reset or check them frequently, potentially losing data if not monitored properly.

Thermoluminescent dosimeters, on the other hand, are designed to measure accumulated exposure over time but do not give a continuous record. When the TLD is read, it can provide a dose equivalent measurement, but it does not generate a permanent record of the exposure history.

In comparison, film badges, while they can become unreadable if not properly processed, typically leave a permanent photographic record of exposure because they react to radiation exposure and can be developed to show accumulated doses. This characteristic sets film badges apart from pocket ionization chambers and TLDs regarding permanent recordkeeping.

Thus, the correct answer effectively identifies the devices in question that lack the capability of providing permanent records of radiation exposure.