Study of color centers in irradiated LiF crystal by positron lifetime  technique

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Study of color centers in irradiated LiF crystal by positron lifetime technique

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- Study of color centers in irradiated LiF crystal by positron lifetime technique
- NUCLEAR TECHNIQUES Issue 12, (1996)
- 作者机构：
  
  1. 中国科学院上海原子核研究所
  2. 上海交通大学
  3. 中国科学院上海原子核研究所上海交通大学
- 作者简介：
- 基金信息：
- DOI：
  CLC： O773
- Published：01 December 1996
- 稿件说明：
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[1]彭郁卿,郑万辉,张怡萍,包于洪,李胜华.辐照LiF单晶中色心的正电子寿命谱研究[J].核技术,1996(12):709-711.

Study of color centers in irradiated LiF crystal by positron lifetime technique[J]. Nuclear techniques, 1996, (12).
[1]彭郁卿,郑万辉,张怡萍,包于洪,李胜华.辐照LiF单晶中色心的正电子寿命谱研究[J].核技术,1996(12):709-711. DOI：

Study of color centers in irradiated LiF crystal by positron lifetime technique[J]. Nuclear techniques, 1996, (12). DOI：

摘要

用６０Ｃｏ源的γ射线辐照纯的ＬｉＦ单晶，剂量范围为０．９９×１０３－１．３×１０６Ｇｙ；用快－慢符合系统测量正电子寿命谱；给出了第二寿命成分τ２及其强度差△Ｉ２随照射剂量的变化。结果表明，在剂量Ｄ≤１×１０４Ｇｙ范围内，τ２基本不变，平均值为２９１ｐｓ，△Ｉ２∝Ｄ１／２，与Ｆ心浓度ＮＦ∝Ｄ１／２系相似，表明有△Ｉ２∝ＮＦ；当剂量增加，Ｆ聚集心出现后，τ２变大，Ｉ２增加变慢，直至出现饱和。

Abstract

The pure LiF crystals were irradiated by 60Co γ-ray with irradiated dose in the range from 0.99×103 to 1.38× 106Gy.The positron lifetime spectra were then measured using a fast-slow coincidence system.The second lifetime component τ2and its intensity difference △I2 were presented. When the irradiated dose D<1 ×104Gy

τ2 is essentially unchanged

while the △I2 is directly proportional to D1/2.Therefore △I2∝NF can be derived since the concentration of F-center NF is also directly proportional to D1/2.As the dose increases futher

the τ2 is increased but the increase of △I2 is very slow till saturation.

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中国科学院国际材料物理中心

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