Determination of 129I in cement-solidified radwastes using neutron activation

被引：5

作者：

Kuo, C. L. ^{[1
,2
]}

Tsai, T. L. ^{[3
]}

Chiang, A. C. ^{[4
]}

Chang-Liao, K. S. ^{[1
]}

Chao, J. H. ^{[4
]}

机构：

[1] Natl Tsing Hua Univ, Inst Nucl Engn & Sci, Hsinchu 30013, Taiwan

[2] Mackay Mem Hosp, Dept Nucl Med, Hsinchu 30013, Taiwan

[3] Inst Nucl Energy Res, Chem Anal Div, Longtan 32546, Taiwan

[4] Natl Tsing Hua Univ, Nucl Sci & Technol Dev Ctr, Hsinchu 30013, Taiwan

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2013年 / 298卷 / 01期

关键词：

Neutron activation; I-129; Cement-solidified radwastes; High-purity germanium detector; Minimum detectable amount; INTERMEDIATE-LEVEL WASTES; REPOSITORY;

D O I：

10.1007/s10967-013-2486-y

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The purpose of this study is to develop a neutron activation method to determine trace amounts of I-129 in cement-solidified radwastes. The radwaste samples were alkaline fused using KOH and then I-129 and iodine carrier were chemically separated by solvent extraction before and after neutron irradiation. Both stable iodine (I-127) and I-129 can be activated by neutrons through I-127 (n, 2n) I-126 and I-129 (n, gamma) I-130 reactions; their activated radionuclides were counted together with a high-purity germanium detector. The chemical recovery yields ranged from 30 to 60 %, and it was found that more than 99.9 % of interfering radionuclides can be removed using solvent extraction after neutron irradiation. The minimum detectable amounts can be lowered to less than 1 mBq g(-1), which is superior to low energy gamma-ray spectrometry by a factor of > 10(2), on average. The established technique can be applied to re-evaluation of I-129 content in radwastes that can be re-classified to lower classes, and the cost for designing a final disposal facility can be significantly reduced.

引用

页码：465 / 473

页数：9