Since these processes can be accompanied by thermoluminescen ce, we have carried out a study of the thermoluminescen ce (TL) curves of alkaline earth sulfates in both the unactivated and activated (with europium and manganese) forms. Excitation was by means of the radioactive isotopes 45Ca and 35S, which were introduced both separately and together during synthesis. Nonradioactive samples were excited by irradiation with a 9~176 source. The absorbed dose was determined using the ferrous sulfate dosimeter and was 103 rad for the nonradioactive sulfates. The isotopes listed are pure fl-emitters with maximum energies: 45Ca 0.254 MeV, 35S 0.167 MeV, 9~176 0.61 and 2.18 MeV, respectively. The radioactive samples: 45CASO4. Eu, 45CASO4-Mn, 45CASO4" Eu. Mn, Ca3SSO4 �9 Eu, CaZSSO4 �9 Mn, Ca3~SO4 - Eu- 1Vln, 45Ca35SO4 - Eu, 45Ca35SOr �9 Mn, 45Ca35SO4 �9 Eu. Mn, Sr35SO4 �9 Eu, Ba35SO4, Ba35SO4 �9 Eu and nonradioactive samples of the unactivated sulfates of strontium and barium were synthesized in sealed quartz tubes by growing them from solution in a sodium chloride melt. The TL curves of these substances were obtained on standard equipment using the generally accepted