1988 Fiscal Year Final Research Report Summary
Sensitization of LiF Thermoluminexcence response by Li (n, ) Reaction
| Project/Area Number |
61550023
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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 |
Applied materials
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| Research Institution | Rikkyo University |
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Principal Investigator |
HARASAWA Susumu Rikkyo University, 原子力研究所, 教授 (90062546)
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| Co-Investigator(Kenkyū-buntansha) |
SHIRAISHI Fumio Rikkyo University, 原子力研究内, 助教授 (20062606)
HATTORI Manabu Rikkyo University, 原子力研究所, 教授 (10062465)
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| Project Period (FY) |
1986 – 1988
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| Keywords | Thermoluminescence / Lif / Li (n, alpha) H / 感度 / リチウムのnーα反応 |
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| Research Abstract |
We found that neutron irradiation to the thermoluminescence (TL) material,LiF(Mg) enhanced the tl sensitivity more than hundred times. The fact was considered due to introduction of new TL centers by (n, alpha) reaction of Li in LiF. Applications of this phnomena for sensitization of TL dosimeter has been investigated here. The investigation was focused to eliminate ^3H from LiF dosimeter, because a pat of this phenomena was found to be due to inner irradiation by low energy beta ray of ^3H and elimination of ^3H was inperative for application. Heat treetment of longer than 1 hour at verious temperature up to 850 C were applied to diffuse out ^3H from LiF. Amount of ^3H was monitored by dose rate of inner irradiation. In contrast with reports about diffusin of ^3H in LiF, inner irradiation did not change. Studies have moved to check the descrepancy of inner irradiation and the results of the reports. The TL center in the LiF was found to be complex with F-like center, Li vacancy and Mg ions, and characteristics of production of TL center was found to be similar with R-or M-center. ^3H are likely traped in the TL complex centers and irradiate directly to TL centers.
Application of neutron irradiation for sensitization of TL in LiF was found not to be suitable because ^3H tightly combine with TL complex center and irradiate the centers directly. In contrast, the detailed structure of TL centers were investivated here.
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