The Measurement of ^182Hf With AMS

^82Hf is a long-lived radionuclide of particular interest for the early history of the solar system The measurement of ^182Hf has been performed with a 13 MV tandem accelerator（HI-13） mass spectrometry at China Institute of Atomic Energy.     

加速器质谱测量^182Hf等长寿命重核素标准样品的制备

通过对长寿命重核素^182Hf、^151Sm等的测量可以确定某些场合的中子注量，能够确定长寿命放射性核素的迁移行为，对核废物安全处置研究具有重要意义。加速器质谱(AMS)技术是实现^182Hf、^151Sm等高灵敏测量的有效方法(测量灵敏度可达到10^-15)，但AMS测量是一种与标准样品比对的相对测量，市场上无所需标样，需自行制备。     

69 ^36Cl AMS标准样品的研制

^182Hf在待测样品中的含量一般很低。加速器质谱（AMS）是实现其高灵敏测量的有效方法，因AMS是一种相对测量方法，需要制备标准样品。W、Ta严重干扰^182Hf的AMS测量，可采用阴离子交换法消除标准样品制备过程中W、Ta的干扰。具体方法如下。     

ABS测量中HfF4与Ag的混合比例对引出^180HfF5ˉ束流大小的影响

加速器质谱（AMS）测量某些核素时，为了提高样品的导热性和导电性，需在样品中掺入一定量的某种导电介质。在对^182Hf的AMS测量研究中，我们一般在所测样品中掺入高纯银粉作为导电介质。由于引出^180HfF5ˉ的束流大小随着HfF4和银粉的不同混合比例而变化，     

用于加速器质谱测量的长寿命核素182Hf标准样品的制备

介绍了用于加速器质谱(AMS)测量的182Hf标准样品的研制过程.主要包括四个步骤:1、放射性核素的人工合成;2、同位素比值的准确测定;3、标准样品的稀释;4、AMS测量样品HfF4的制备.目前,合成标样的起始同位素比182Hf/180Hf的TIMS测定结果为(2.33±.07)×10-6,并研制出了一系列标准样品,182Hf/180f的比值从10-6到10-13,并且给出了不同比值标准样品的不确定度.     

Measurement of Negative Ion Current of ^180HfF5^- as a Function of the Ratio of HfF4 to Ag

In Accelerator mass spectrometry （AMS） measurement, it usually need mix metal powder into samples. During ^182Hf measurement, usually we mix HfF4 with certain silver powder. As we found the negative ion current of ^180HfF5^- changes when different proportion of Ag＋HfF4 samples were used. In measurement of ^182Hf we need as larger ^180HfF5^- ion current as possible, so in this work we studied the negative ion current of ^180HfF5^- with different mass ration of Ag to HfF4 samples.     

加速器质谱测量用HfF_4的固相合成研究

HfO2样品通过分离纯化流程后,与NH4HF2进行固相反应制成HfF4,并用加速器质谱进行测量。结果表明:α-安息香肟萃取是降低182W含量的重要步骤;固相合成法制备的HfF4样品中180HfF5-的引出束流强度是同等条件下液相合成法的3-4倍;制样方法(固相合成法、液相合成法)对182W/Hf值影响不大;HfF4中182W/Hf值低至10-11g·g-1量级。     

一台用于重核素测量的能量-飞行时间探测系统

研制了一台用于重核素测量的能量-飞行时间探测系统.探测系统由飞行时间探测器和金硅面垒型能量探测器组成,金硅面垒型探测器兼做飞行时间探测器的停止探测器.用该探测系统在中国原子能科学研究院串列加速器质谱装置上对182Hf9+离子的能量-飞行时间双维谱进行了测量.该探测系统对77.4 MeV182Hf9+离子的能量分辨率为3.8％,飞行时间分辨为0.8ns.     

钨在树脂上的吸附行为研究

某些样品中182Hf的含量测量至关重要。182Hf半衰期为9×106a,由两次180Hf(n,γ)反应产生,生成含量极低,对它的分析必须采用AMS。对182Hf进行AMS分析之前,必须以很高的去污因子对钨进行去污,以消除同量异位素182W的干扰。借鉴前人的研究成果,本工作采用离子交换法进行分离。应用     

~(182)Hf的AMS测量研究

182Hf是一长寿命放射性核素,其半衰期约为9×106a。测量环境样品中的182Hf对核天体物理学的研究具有重要的意义。AMS作为一超高灵敏核分析技术,可以测量样品中极其微量的182Hf。本工作研究了HfF4样品的制备以及去钨流程,并在中国原子能科学研究院HI-13串列加速器AMS装置上对182     

Sorption Behaviour of W on Ion Exchangers

The half-life of 182Hf is long (T1/2=9×106 a) and the content of 182Hf is very low,accelerator mass spectrometry(AMS) must be used to detect it. However,the stable isobar 182W is a main interference for the AMS measurement of 182Hf. Therefore,the researc…     

Measurement of ~(182)Hf With AMS

182Hf with its half-life of about 9 million years is a long-lived radionuclide. It is very important for nuclear astrophysics research to detect minute amounts of 182Hf with AMS, a ultra-high sensitive nuclear analyzing technique. In present work, the pro…     

胺类萃取剂高效分离Hf(Ⅳ)与W(Ⅵ)的方法研究

针对某些环境样品中182Hf的加速器质谱(AMS)分析,以N1923和TOA为萃取剂,研究了不同无机酸、酸浓度、络合剂浓度、萃取剂浓度、稀释剂类型等因素对Hf(Ⅳ)与W(Ⅵ)萃取行为的影响,建立了胺类萃取体系分离Hf(Ⅳ)与W(Ⅵ)的方法。该法对Hf(Ⅳ)的回收率大于90%,对毫克量级W(Ⅵ)的去污因子为4.4×107。     

Study on Preparation of ~(182)Hf AMS Standards

The neutron-rich isotope ~(182)Hf with its half-life of (9±2)×10~6 a produced by neutron activation canbe used to determine the neutron flux of some places, in order to study the transport of radioactivenuclides and the safe disposal of nuclear waste. AMS is a kind of relative measurement method with highsensitivity (10~(-15)), it requires corresponding standard samples. This subject concerned in the preparation of~(182)Hf standard sample for AMS measurement.     

The Measurement of ~(182)Hf With AMS

82Hf is a long-lived radionuclide of particular interest for the early history of the solar system[1, 2]. The measurement of 182Hf has been performed with a 13 MV tandem accelerator(HI-13) mass spectrometry at China Institute of Atomic Energy. In this wor…     

Measurement of Negative Ion Current of ~(180)HfF_5~-as a Function of the Ratio of HfF_4 to Ag

In Accelerator mass spectrometry (AMS) measurement, it usually need mix metal powder into samples. During 182Hf measurement, usually we mix HfF4 with certain silver powder. As we found the     

用于加速器质谱测量的^15Sm标准样品研制

^151Sm是一种长寿命（T1／2=90a）裂变产物核素，对^151Sm的精确测量可以为环境科学、生命科学、核数据等领域提供重要信息。然而，^151Sm在样品中的含量很低，放射性弱，加速器质谱（AMS）是实现^151Sm高灵敏测量的有效方法。AMS是一种与标准样品比对的相对测量方法，本工作主要涉及^151Sm标准样品研制。     

75 加速器质谱测量^151Sm标准样品的研制——Sm样品中Eu的化学分离

^151Sm是一种长寿命裂变产物核（半衰期为90a），测量^151Sm对核物理、环境科学、生物科学等众多领域的研究具有重要的意义。加速器质谱（AMS）可实现痕量^151Sm的测量。AMS是一种相对测量方法，需要标准样品。但是在质谱测量中Eu对^151Sm形成很强的干扰，因此标样的研制过程中Eu的化学分离显得尤为重要。     

Study on Preparation of ~(182)Hf AMS Standards——Chemical Separation of W, Ta From the Sample of Hf

182Hf is a very important nuclide in many fields; its content is very low. AMS is a kind of relativemeasurement with high sensitivity (isotopic ratio is about 10-15), which requires standards. But the interference of W, Ta is very strong in the measuremen…     

Mass Resolution Measurement of New Injection System for AMS

The mass resolution of 80 for the old AMS injection system at CIAE could not satisfy the requirement for 182Hf measurement. Therefore, a new injector dedicated for AMS with a 90° spherical electrostatic deflection and a 112° double-focusing analyzing magnet was built with a designed maximum mass resolution of 430.