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ABRAMISHVILI (a), V. I. ALTUKHOV (b), T. L. KWEGISHVILI (a), and V. G. KVACHADZE (a) The effect of y-irradiation an heat conduction x(T) and the speotra of optical and paramagnetic absorption of MgO orystals are studied. For the first time two stages of thermal destruction of optical absorption bands are found and their relation with the process of thermal recovery x(T) is established. Contributions to the heat conduction due t o both, resonance scattering of phonons on paramagnetic ions Cr2+ (generated in the process of irradiation on account of the change of the impurity valence of Cr*+ and Fe") and Rayleigh scattering on radiation (including proper) defeuts of the MgO lattice are analysed. From the comparison of the calculated data of heat conduction x ( T) with pertinent experimental data on Cr2+ ion concentration and effectiveness of Rayleigh and anharmonic phonon scattering in MgO crystals are obtained.wcizoro H napaMarHsTHoro noraromeHm IE~HCT~JIJIOB MgO. BnepsbIe 06aapy~ee~b1 ase cTamza TeaapusecKoro pa3pymemn IIOJIOC OnTmecKoro nornomemn H ycrmosneHa HX TemonpoBonHocTb KaK OT p e 3 o~a~c~o r o pacceamn @OHOHOB Ha napaMarHmnidx Mecet Cr3+ EI Fe2+ TaK EI OT peneeBcHoro paccemm na pannamomux (B TOM m c n e H HCCJIeAOBaHO BJIHRHkle raMMa-06JIy' IeHHFI Ha TeIIJIOIIpOBOHHOCTL X ( T ) , CIIeKTpbl OIITH-CBR3b C IIpo~eccoM TepMHsecIEoro BOCCTaHOBJIeHHR x( T) . AHaJIH3HpyWTCZ BIE3IagbI B HOHax cr2+, 06paay1onp1xc~ B XOAe O~J I Y Y~H H R 38 CZIeT H3MeHeHEIR BaJIeHTHOCTEl npH-C06CTBeHHbIX) n;e@XTaX PeIIIeTIEEl MgO. kI3 COIIOCTaBJIeHHR Pe3YJILTaTOB paCseTa Te-IIJIOIIpOBOAHOCTH %( T) C COOTBeTCTBYIOUjEIMEI 3KCnePHMeHTaMEI IIOJIyWHbI AaHHLIe 0 KOH-WeHTpaumx HOHOB Cr2+ a ~#@~IFTHBHOCTSIX peJreeBcKoro EI aHrapMoHmecKoro paccerr-HHSI @OHOHOB B HpacTamax MgO.

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