Scintilatoru materiālu spektroskopiskie pētījumi: CsT: TI, CdWO4 : Mo un ar Tb aktivēti oksifluorīdi
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Latvijas Universitāte
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Darbā iekļauti triju scintilatoru materiālu: CdWO4:Mo, CsI:Tl un oksifluorīdu stiklu
un stiklu keramiku, pētījumi. CdWO4 ar Mo piejaukumiem EPR hipersīkās struktūras
spektru var izskaidrot, izmantojot hipersīkās mijiedarbības modeli ar divām Cd
kodolu grupām, kurās ir 2 un 3 ekvivalentie kodoli. Tika pētīts apstarota CsI:Tl
spektra EPR leņķisko atkarību spektrs, kas tika detektēts ar absorbcijas magnētisko
cirkulāro dihroismu (MCD). Eksperimentālo spektru var izskaidrot vienīgi ar
nespārnotā spina hipersīko mijiedarbību ar 3 Tl kodoliem. Katodluminiscences spektri
un dzišanas laiki tika pētīti ar Tb un Yb aktivētiem oksifluorīdu stikliem un stiklu
keramikām ar sastāvu SiO2 - Al203 - Na2O - LaF3 – NaF un tika analizētas dzišanas
laiku un luminiscences joslu attiecību atkarības no Tb koncentrācijas.
Atslēgas vārdi: CdWO4:Mo, CsI:Tl, Tb oksifluorīdi.
Abstract The present work includes the studies of three scintillator materials: CdWO4:Mo, CsI:Tl and oxyfluoride glasses and glass ceramics. The EPR hyperfine structure spectrum of the CdWO4 crystal with Mo impurities could be explained using a model of a hyperfine interaction with two Cd groups of 2 and 3 equivalent nuclei, respectively. EPR angular dependency spectrum of the irradiated CsI:Tl crystal detected by the magnetic circular dichroism of absorption (MCD) has been studied. Spectra could be explained only by an unpaired spin hyperfine interaction with 3 Tl nuclei. Cathodoluminescence spectra and decay times of Tb and Yb activated oxyfluoride glass and glass ceramics with the composition SiO2 - Al203 - Na2O - LaF3 - NaF have been studied. Dependences of the decay times and luminescence bands ratios on Tb concentration have been analyzed. Key words: CdWO4 :Mo,CsI:Tl, Tb oxyfluoride.
Abstract The present work includes the studies of three scintillator materials: CdWO4:Mo, CsI:Tl and oxyfluoride glasses and glass ceramics. The EPR hyperfine structure spectrum of the CdWO4 crystal with Mo impurities could be explained using a model of a hyperfine interaction with two Cd groups of 2 and 3 equivalent nuclei, respectively. EPR angular dependency spectrum of the irradiated CsI:Tl crystal detected by the magnetic circular dichroism of absorption (MCD) has been studied. Spectra could be explained only by an unpaired spin hyperfine interaction with 3 Tl nuclei. Cathodoluminescence spectra and decay times of Tb and Yb activated oxyfluoride glass and glass ceramics with the composition SiO2 - Al203 - Na2O - LaF3 - NaF have been studied. Dependences of the decay times and luminescence bands ratios on Tb concentration have been analyzed. Key words: CdWO4 :Mo,CsI:Tl, Tb oxyfluoride.