FIELD: physics.
SUBSTANCE: invention relates to optically stimulated luminescent (OSL) dosimetry, associated with developing and using working media for OSL detectors suitable for detecting X-ray, gamma and electron radiation and for detecting slow neutrons. The working medium for an OSL detector for dosimetry in mixed fields of ionising radiations, which includes sodium fluoride, copper chloride or fluoride, further contains lithium fluoride 6LiF with the following ratio of components (mol %): NaF 95.9-98.99; CuCl2/CuF2 0.01-0.1; 6LiF 1-4.
EFFECT: detecting X-ray, gamma and electron radiation, as well as slow neutrons.