  Highly sensitive LiF:Mg,Cu,P (MCP) detectors enable measurements of radiation
doses from tens of nanograys up to a few kilograys, where the saturation of the
signal of the main dosimetric peak occurs. Thanks to the recently observed
high-dose high-temperature emission of MCP detectors heated to temperatures up
to 600{\deg}C after exposures to radiation doses ranging from 1 kGy to 1 MGy, a
new method of TL measurement of radiation doses has been recently developed at
the Institute of Nuclear Physics (IFJ). This method can measure doses ranging
from micrograys up to a megagray. So far, high dose measurements were performed
on fresh MCP samples and each detector was used only once, because as a result
of these measurements, the detectors lose their sensitivity to a large extent.
In this study, a specific thermal treatment intended to fully restore the loss
of MCPs TL sensitivity was sought. We have investigated several annealing
procedures, applying different temperatures (from 400{\deg}C up to 700{\deg}C)
for different periods of time (10-30 minutes) in argon atmosphere. In this way
we were able to recover MCP sensitivity fully, allowing for reuse of the
samples after high-dose irradiation and high-temperature measurement.
