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Precise Measurement of γ-ray Emission Probabilities for Br-80 and Ru-105

Br-80 和 Ru-105 γ 射线发射概率的精确测量

基本信息

批准号：
15560724
负责人：
MIYAHARA Hiroshi
金额：
$ 1.09万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Sources of ^<80,80m>Br and ^<105>Ru were produced by thermal neutron irradiation of enriched Na^<79>Br (enrichment:99.41%) and ^<104>Ru (99.21%) metal powder at KURRI. Sources for absolute measurement were prepared on metallized VYNS films from HCl solution containing the suspended powder, and the disintegration rates and the γ-ray intensities were measured by a 4πβ-γ(HPGe) coincidence apparatus using a two-dimensional data-acquisition system. The γ-ray detection efficiencies for the HPGe detector were calibrated in each series of measurements by standard sources of ^<24>Na,^<57>Co,^<60>Co,^<133>Ba,^<134>Cs and ^<152>Eu. These sources were prepared from radioactive solution and measured by the same apparatus.The internal conversion electrons from ^<80m>Br (4.42 h) affect for disintegration rate measurement of ^<80>Br (17.68 m), and the β-rays from ^<24>Na (14.965 h) are also counted in the 4πβ-counter. On the other hand, ^<105>Rh, daughter of ^<105>Ru, decays by β-particle emission with half-life of 35.36 h. Therefore, it was necessary various attention in the measurements and data treatments.The γ-ray emission probability of 616.3 keV for ^<80>Br was 6.14±0.05% and the previously reported value of 6.7±0.6% were larger by about 10%. The data for ^<105>Ru were in agreement with the evaluated values within the uncertainties, but uncertainties were greatly improved from 3% to 0.6% for intense γ-ray. On the other hand, those of 306.1 keV and 318.9 keV for ^<105>Rh were 4.76±0.05% and 16.99±0.17% and the evaluated values of 5.1±0.6% and 19.1±0.6% were larger by about 10%.

在<105>KURRI，通过热中子辐照富集的Na^<79>Br（富集度：99.41%）和^<104>Ru（99.21%）金属粉末产生了^<80，80 m>Br和^ Ru源。用含有悬浮粉末的HCl溶液在金属化VYNS膜上制备绝对测量源，用4πβ-γ（HPGe）符合装置和二维数据采集系统测量衰变率和γ射线强度。在每一系列的测量中，用~ <24>Na、~ <57>Co、~ Co<60>、~ <133>Ba、~ <134>Cs和~ <152>Eu的标准源校准HPGe探测器的γ射线探测效率。这些源均由放射性溶液制备，用同一装置测量，由^ Br（4.42 h）产生的内转换电子影响<80m>对^<80>Br（17.68 m）的衰变率测量，由^<24>Na（14.965 h）产生的β射线也在4πβ计数器中计数。另一方面，<105>^ Ru的子体^ Rh<105>通过β粒子发射衰变，半衰期为35.36 h。在616.3keV的γ射线发射几率<80>为6.14±0.05%，比文献报道的6.7±0.6%大了约10%。在<105>不确定度范围内，~（13）Ru的测量值与估算值符合较好，但对于强γ射线，不确定度从3%提高到0.6%。另一方面，306.1 keV和318.9 keV的α Rh的那些<105>分别为4.76±0.05%和16.99±0.17%，并且5.1±0.6%和19.1±0.6%的评估值大了约10%。