多接收电感耦合等离子体质谱法测定79Se

The analysis of ⁷⁹Se in high radioactive waste using a multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) is described, Hexapole collision cell was used to remove argide-based interferences, which have always presented a problem to the measurement of certain elements, such as Ca, Cr, Fe, and Se. ⁷⁸SeH was deducted from the measurement of ⁷⁹Se.     

79Se-AMS生物示踪方法学的研究

由于具有放射性非常弱以及对生物组织甚至是细胞无损伤的特点，⁷⁹Se是对硒元素进行长期无损伤生命科学研究的理想示踪核素。⁷⁹Se示踪方法学的建立对于硒的生命科学与生物医学研究将具有十分特殊的意义。加速器质谱测量⁷⁹Se（⁷⁹Se-AMS）的生物示踪方法学具有高灵敏度，高准确性以及高精度等特点。通过采用⁷⁹Se-AMS方法对亚毒性剂量的硒代谢过程进行研究，建立了⁷⁹Se-AMS生物示踪方法学，重点探索了生物示踪样品的制备流程，化学处理以及样品测量过程。采用分子负离子的引出形式以及四阳极双栅电离室对⁷⁹Se和⁷⁹Br两种同量异位素进行鉴别，从而记录实际样品中⁷⁹Se的原子个数。实验建立了亚毒性剂量硒在Wistar大鼠肾脏内的代谢曲线，为生命科学以及生物医学领域提供了新的测量方法与手段，也为AMS的应用开拓了新的领域。     

光学玻璃105-1013泊粘度的测定

光学玻璃生产制造的全过程中,玻璃的澄清、搅拌、出炉、成型都与玻璃的粘度有关。     

53Mn/55Mn实验室标准样品制备及加速器质谱测量

宇宙成因核素⁵³Mn是一种非常理想的地质定年工具。近年来,随着加速器质谱（AMS）技术的不断发展,⁵³Mn的高灵敏测量成为可能。本工作介绍了⁵³Mn/⁵⁵Mn的系列实验室标准样品的制备以及AMS测量,结果表明：⁵³Mn/⁵⁵Mn的测量值与标称值在误差范围内比较吻合且呈现良好的线性关系,中国原子能科学研究院的AMS系统对⁵³Mn的测量灵敏度可以达到10^-14。     

多接收电感耦合等离子体质谱测定182Hf/180Hf的方法研究

¹⁸²Hf is an important radionuclide for nuclear research and supernova explosions. The reference material of ¹⁸²Hf/¹⁸⁰Hf is especially important, but not yet available. Considering the demands of nuclear science research an development, a method was developed to measure the ratio of ¹⁸²Hf/¹⁸⁰Hf with high-precision by using multi-collector inductively plasma mass spectrometry (MC-ICP-MS). The operating parameters of MC-ICP-MS were optimized. Isobar interference and mass bias were studied. The measurement result of the ratio of ¹⁸²Hf/¹⁸⁰Hf was obtained based on deducting the interference of isobaric ¹⁸²W.     

ICP-MS测定辐射环境监测样品中238U和232Th比活度实践

Monitoring of ²³⁸U and ²³²Th in radiation environmental samples including water and biota was requested by the related international and national safety guides and standards. Inductively coupled plasma mass spectrometry (ICP-MS) was applicable to determination of ²³⁸U, ²³²Th in such samples with a high sensitivity and working efficiency. Some practical aspects are presented.     

同位素稀释-热电离质谱法测定乏燃料中裂变产物121Sn和126Sn

乏燃料样品基体复杂、具有放射性,裂变产物锡含量低,难以准确测定。本研究以天然锡（Sn）标准溶液为稀释剂,采用同位素稀释-热电离质谱法测定乏燃料元件中¹²¹Sn和¹²⁶Sn裂变产物的含量。热电离质谱测量时采用硅胶 锡 磷酸涂样,优化选择电离带升温速率和温度保持时间,利用阻滞电位四极杆（RPQ）跳峰对13个质量数信号进行数据采集,有效扣除了Te、Sb、CaPO₃⁺多个同量异位素的干扰,获得了ng/g级Sn的含量及同位素丰度测量数据。乏燃料元件中¹²¹Sn和¹²⁶Sn的质量浓度分别为5.5、230.5 ng/g,测量不确定度分别为4.2%和1.4%（k=2）。     

H2O2浸泡对无机碳酸盐沉积11B的影响

Pretreatments were used to remove organic “contaminant” material prior to isotopic analyses of coral skeletal samples. We conducted one experiments to test the pretreatment effect of 30% hydrogen peroxide (H₂O₂) on the boron isotopic composition of inorganic carbonate. The experimental results indicate that H₂O₂ can change the boron isotopic composition.     

加速器质谱测量93Zr的刻度研究

A method of determination for ⁹³Zr/⁹²Zr ratio by multi-collector inductively plasma mass spectrometry (MC-ICP-MS) was described in this paper. A ⁹³Zr/⁹²Zr ratio of (2.75±0.07)×10^－5 was obtained in the original sample for AMS measurement and its relative standard error was 2.5%. Considered the contribute of above-thermal neutron, a calculated ⁹³Zr/⁹²Zr ratio of 2.56×10^－5 was obtained and it was according with measurement of the result. The results showed that it can be used for AMS measurement standards sample preparation. A series 93Zr standards sample for AMS measurement were diluted by irradiated sample with enriched 92Zr.     

同质异位素干扰下同位素比的ETV-ICP-MS测定

A self-made electrothermal vaporization (ETV) device was used to solve the isobaric interference in the isotope ratio analysis by ICP-MS. As a sampling method used in ICP-MS, ETV was used about twenty years and performed many merits. One of these merits is that it can separate the matrix of sample online according to the different evaporation rate of different element or compound on the filament of ETV. By this character, the isotope ratio of ¹⁷⁶Lu/¹⁷⁵Lu , as a example, was determined under the isobaric interference of ¹⁷⁶Yb by ETV-ICP-MS .     

EGC/GC和EGCG/GCG的ESI-IT-TOF质谱裂解规律研究

利用离子阱飞行时间质谱仪的高质量准确度、高分辨率、多级测定的性能，对表没食子儿茶素/没食子儿茶素(EGC/GC)和表没食子儿茶素没食子酸酯/没食子儿茶素没食子酸酯(EGCG/GCG)（二组对映异构体）的质谱裂解规律进行了研究，并利用氢/氘交换的方法对其裂解方式进行了确证。研究发现，儿茶素对映异构体间具有相同的质谱裂解途径，即使在多级质谱中也无明显区别，仅碎片离子的相对丰度存在差异。二级质谱中， EGC/GC在B环丢失CO₂，且其A, B环都可失去C₂H₂O。^1,4A^-、^1,3A^-、^1,2A^- 和[M-H-B环]^-四个碎片离子是EGC/GC的特征性离子，通过此四离子质荷比的变化，可推测A环上的取代情况。因EGCG/GCG的结构上都含有没食子酸的取代基，在二级质谱中均可见m/z 169的特征性离子峰，此离子可用于EGCG/GCG和EGC/GC的区分。     

钚气溶胶直接进样ICP-MS快速分析技术-6级高效过滤器后钚气溶胶的定量

A technique for fast analysis of plutonium in airborne aerosol was developed with directly sampling ICP-MS in this laboratory. And the Pu-242 aerosol particle addition calibration method was established. The nebulized Pu-242 solution aerosol was quantitatively mixed with the airborne aerosol and then introduced into ICP-MS. The results show that the detection limit for Pu-239 concentration is down to 1.4×10^－6 Bq·L^－3. The airborne aerosol sample after through a high efficiency particulate air (HEPA) filter with six stages (efficiency per stage 99.95%) was analyzed using this technique, the plutonium concentration determined is 3×10^－4 Bq·L^－3. However plutonium could not be detected when sampling using HEPA filter at same situation, airborne aerosol also could not be detected at same situation with Condensation Particle Counter (CPC). This result shows there were some tiny plutonium particulates which passed through the six stages HEPA filter with airflow and could not be collected by the HEPA filter     

葡萄酒中锶的分离及MC-ICP-MS测量

Isotopes can be applied to food geographical origin traceability as “fingerprint”. The radioactive disintegration of Sr in different samples leads to variation of ⁸⁷Sr /⁸⁶Sr in nature. Sr in wine comes from soils, rocks and water in vine yard, ⁸⁷Sr /⁸⁶Sr can give much information about the geographical origin of wine. This paper describes in details the separation procedure by Sr-resin and determination by MC-ICP-MS.