Coincidence Doppler broadening of positron annihilation radiation for detection of helium in irradiated Ni and Cu
Coincidence Doppler broadening of positron annihilation radiation for detection of helium in irradiated Ni and Cu
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DOI：
10.2320/matertrans.47.2885
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发表时间：
2006-11-01
影响因子：
1.2
通讯作者：
Nagata, S.
中科院分区：
文献类型：
--
作者：
Xu, Q.;Ishizaki, T.;Nagata, S.
采用一种新的成分分析方法--正电子湮没辐射的符合多普勒展宽（CDB）方法，对离子辐照Ni和中子辐照Cu中的He原子进行了探测。正电子寿命和透射电子显微镜（TEM）的结果表明，在离子辐照的镍和中子辐照的铜，分别形成的微孔和空洞。CDB测量的结果表明，He原子存在于微孔和空洞，甚至在1273 K退火的离子辐照Ni的微孔。符合多普勒展宽测量是一种无损检测材料的方法，对氦原子的探测是有效的。
A new composition analysis method, namely, coincidence Doppler broadening (CDB) of positron annihilation radiation, was employed to detect He atoms in ion irradiated Ni and neutron irradiated Cu. The results of positron lifetime and transmission electron microscopy (TEM) show that microvoids and voids were formed in ion-irradiated Ni and neutron-irradiated Cu, respectively. The results of CDB measurements indicate that He atoms were present in the microvoids and voids, even in microvoids annealed at 1273 K in ion-irradiated Ni. Coincidence Doppler broadening measurement, which is a nondestructive technique for testing materials, is effective for detecting He atoms.