γ能谱法测定高浓铀样品年龄  

Age-Dating of Highly Enriched Uranium by Gamma Spectroscopy

作　　者：吕学升[1] 金惠民[1] 刘大鸣[1] 刘国荣[1] 赵永刚[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核化学与放射化学》2008年第4期243-247,共5页Journal of Nuclear and Radiochemistry

摘　　要：建立了用γ能谱法测定铀年龄的方法,用低本底高分辨γ谱仪通过测定214Bi/234U活度比得到高浓铀样品的年龄。由于采用了内部效率自刻度,因此,该方法不受样品物理形态和几何形状的限制,也不需要用标准样品对系统进行效率刻度。对硝酸铀酰样品的铀年龄测量结果为18.00(4.1%)年,与样品实际年龄的相对偏差为-4.8%,误差主要来源于234U/235U比值的测量误差。The age of uranium samples are measured through the radioactivity ratio of 214^Bi/234^U by gamma spectrometry. The principle of measurement for radioactivity ratio of 234^U/235^U, 234^U/235^U and 214^Bi/238^U using intrinsic efficiency calibration is discussed. The measurement is a nondestructive assay method for uranium age-dating by gamma spectrometry which is applicable to materials in any physical form and geometrical shape. Two different physical form and geometrical shape samples are measured and investigated, one is U3O8 powder, the other is uranyl nitrate. The measurement results are 27.25 and 18.00 a respectively. For the uranyl nitrate sample, the relative standard deviation of highly enriched uranium （HEU） age determination is less than 5% between the measured and declared age.

关 键 词：铀年龄 低本底γ谱仪 

分 类 号：TL249[核科学技术—核燃料循环与材料]