波谱学杂志 ›› 1993, Vol. 10 ›› Issue (4): 405-412.

• 研究论文 • 上一篇    下一篇

掺杂LiF的ESR谱和ENDOR谱研究

孙福印1, 焦玲2, 武建伟1, 杨正红1   

  1. 1. 中国医学科学院放射医学研究所, 天津 300192;
    2. 北京医科大学天然药物及仿生药物国家重点实验室, 北京 100083
  • 收稿日期:1992-05-19 修回日期:1993-02-26 出版日期:1993-12-05 发布日期:2018-01-20
  • 基金资助:
    国家自然科学基金

STUDY OF ESR AND ENDOR SPECTRUM OF LiF DOPED WITH IMPURITIES

Sun Fuyin1, Yang Zhenghong2, Jiao Ling1, Wu Jianwei1   

  1. 1. Institute of Radiation Medicine, Chinese Academy of Medical Sciences, Tianjin 300192;
    2. State Key Lab. of Natural and Bionics Drugs, Beijing Medical University, Beijing 100083
  • Received:1992-05-19 Revised:1993-02-26 Online:1993-12-05 Published:2018-01-20

摘要: LiF:Mg,Cu热释光(TL)磷光体在γ辐照后产生F0顺磁中心,其g因子为gxx=2.0030,gyy=2.0450,gzz=2.0251,裂分为Axx=511.04G,Ayy=505.42G,Azz=507.26G。F0中心的浓度随Mg++浓度的增加而下降。磷光体的ENDOR谱显示F0中心附近有铜核存在。照射前和照射后24h测量均未发现Cu++的ESR谱,表明铜是以Cu+形式掺入的,照射并未引起Cu+离子化合价的改变。LiF:Mg,Cu,P在γ辐照前具有轴对称的Cu++离子的ESR谱,辐照后产生了O-空穴中心和PO32-自由基,改变了Cu++的环境,使Cu++的谱发

关键词: 掺杂LiF, 热释光磷光体, γ照射, ESR, ENDOR

Abstract: A paramagnetic center F0 was found in thermoluminescent (TL) phosphor LiF:Mg,Cu,irradiated with γ-rays and the g values of its ESR spectrum are gxx=2.0030, gyy=2.0450 and gzz=2.0215 with the splitting values of Axx=511.04G, Ayy=505.42G, Azz=507.26G, respectively. The concentration of F0 enters decrease with the increase of Mg++ concentration. The ENDOR spectrum of the phosphor shows the existance of Cu nuclei near F0 enter. The impurity Cu in LiF:Mg,Cu, is in the state of Cu+ and its valence did not change directly by γ-irradiation as no ESR signal of Cu++ was observed either before or after the irradiation. The axial symmetry ESR signal of Cu++ can be found in the ESR spectrum of LiF:Mg,Cu,P before γ-irradiation. After the irradiation the ESR peaks of O- hole centers and free radicals of PO32- were produced and the environment of Cu++ in LiF:Mg,Cu,P phosphor was changed. These results are helpful to explain the function of Cu and P in the thermoluminesence of LiF:Mg,Cu,P.

Key words: Doped LiF, Thermoluminescent (TL) phosphor, γ-irradiation, ESR, ENDOR