岩石样品中铪的无载体分离  

Separation of No-Carrier-Added Radioactive Hafnium From Rock Samples

作　　者：姜涛[1] 何玉晖[1] 杨通在[1] 王丽雄[1] 杨君[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《核化学与放射化学》2007年第2期108-112,共5页Journal of Nuclear and Radiochemistry

摘　　要：本工作从岩石样品的溶解出发,考察了N-苯甲酰-N-苯基羟胺对铪的萃取以及阴阳离子树脂对铪的分离效果,以同位素181Hf为示踪剂,结合γ谱测量技术对这些过程进行了表征。初步建立了10 g岩石样品的混合溶样(先碱熔再酸溶)方法,建立了以萃取和阴阳离子交换为分离手段的铪的无载体分离纯化流程,并对各步流程的放化回收率进行了测定。溶样过程的放化回收率约为94%,分离流程的化学回收率约为52%。In order to effectively extract no-carrier-added radioactive hafnium, such as ^176 Hf in archaeological dating or ^182 Hf in nuclear astrophysics, three dissolution methods, the alkali melting, the acid dissolution, and a combination of both were studied by using ^181Hf as a tracer whose T-rays were measured with a HPGe gamma spectrometer. The radiochemical yield of ^181Hf during its separation and purification from the leaching solution by anionic exchange chromatography, cationic exchange chromatography, and solvent extraction with Nbenzoyl-N-phenylhydroxylamine were separately studied. A complete process for dissolution, concentration, separation and purification of hafnium from rack sample is suggested. The radiochemical yields for each step were measured. A recovery of 94% in the rock sample dissolution stage, and 52% in the separation and purification stage are achieved.

关 键 词：岩石 铪 萃取 离子交换 无载体 

分 类 号：P5[天文地球—地质学]