1991 Fiscal Year Final Research Report Summary
Characteristic of thermoluminescence in some minerals exposed to the natural radiation and cosmic ray, and its application to meteorites
| Project/Area Number |
02640239
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Osaka Sangyo University |
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Principal Investigator |
FUKUDA Yasunori Osaka Sangyo University. Liberal Arts. Professor., 教養部, 教授 (80066943)
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| Co-Investigator(Kenkyū-buntansha) |
MORIMOTO Nobuo Osaka Sangyo University. Liberal Arts. Professor., 教養部, 教授 (10029829)
HASEGAWA Hiroichi Osaka Sangyo University. Liberal Arts. Professor., 教養部, 教授 (20025232)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Alkalin feldspars / TL / TL glow peak / anomalous fading / thermal cleaning / natural / X irradiated / emission band |
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| Research Abstract |
Thermoluminescence (TL) in alkalin feldspars and whitlockite (beta-Ca_3(PO_4)_2) have been investigated. For heating rate 2OK/min, the TL glow peaks in the natural feldspars appear roughly at the temperature region 200'C - 300'C. In microcline, amazonite, orthoclase, the prominent glow peak is found at about 250. OC - 2700C. On the other hand, the TL glow peaks in X irradiated alkalin feldspars are found at the temper region 800C - 200*C, and the TL glow peaks are not found at the temperature region of natural feldspars.
In X irradiated albite, the TL glow peaks are found at 800C, 1100C, 1700C, 2300C, 3000C by means of the thermal cleaning. The overlap of these TL glow curves may be related to the anomalous fading.
The emission band at about 400nm - 425nm may be due to the AlO^--Al center or AlO_4^<5-> center, and the emission band at 275nm may be related to Pb^+ ions.
The TL emission spectra for Ca_3(PO_4)_2 doped with CeO_2 show a maximum at 350nm for all temperatures during TL measurements. The emission is possibly due to the recombination reaction
Ce^<4+> + e -> Ce^<3+*> -> Ce^<3+> +hnu (350nm).
The TL intensity is changed by Ce^<3+> codoped Tm^<3+>.
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