STUDY ON OCCURENCE FORM OF PLATINUM IN XINJIE Cu—Pt DEPOSIT BY NAA AND SCANNING PROTON MICROPROBE

A combination of NAA and micro-PIXE was used to study concentrations and distributions of platinum group elements (PGE) in ores from Xinjie Cu-Pt deposit.The NAA results of the bulk indicate that the ores belong to the enriched Pt-Pd type.The element concentration maps of scanning micro-PIXE for the ores show that the occurence form of Pt is independent arsenide minerals.No PGE were detected in chalcopyrite of Xinjie Cu-Pt deposit.These information are economically beneficial to the mineral smelting process.     

STUDY ON THE DISTRIBUTION OF SELENIUM AND OTHER ELEMENTS IN CORN SAMPLES BY NAA AND BIOCHEMICAL TECHNIQUE

Biochemical technique was used to separate three kinds of proteins (albumin, globulin and gliadin) in corn samples froin high selenium areas and normal areas in Erxi autonomous region of Hubei Province, China. The contents of Se and other elements in these proteins were determined by neutron activation analysis (NAA). The results show that Se is enriched in corn proteins at high selenium area, while Cu, Al, Mn, V and Cl are also enriched in varying degrees.     

DISTRIBUTION OF SOME ELEMENTS IN HUMAN HAIR AND ORGANS DETERMINED BY NAA

Twenty four male autopsies were obtained from Shanghai. The samples of liver, lung, kidney cortex, brain and scalp hair were collected from the autopsies. The elements As, Br, Ca, Cd, Cl, Co, Cr, Cu, Fe, Hg, Mg, Mn, Na, Rb, 8, Se and Zn were determined by neutron activation analysis (NAA). The present study provides the elemental levels of different tissues for normal male adults. The distribution pattern of elements was discussed. Great difference on distribution of some elements in different tissues was observed.     

IDENTIFICATION OF MARINE AEROSOL COMPONENT BY COMBINED NAA AND SCANNING ELECTRON MICROSCOPY WITH X—RAY ANALYSIS

The concentrations of 30 elements in aerosol particles collected in western Pacific ocean have been determined by INAA. The crustal element concentrations decrease with increasing distance from land over the remote area close to Asia land and fluctuate around its average value over the remote ocean area. The volatile elements exhibite average atmospheric concentrations that are higher than those expected from the flux of seasalt or the continental dust. In order to identify marine aerosol component originating from the continent or ocean, the aerosol particles are examined by scanning electron microscopy combined with energy dispersive X-ray spectroscopy. Particle phase structure shows that the crustal aerosol particles are not present internal mixtures with seasalt aerosol, and it also proves the long-range transport of crustal elements from continent to ocean.     

CALCULATION AND ANALYSIS OF PROTON INDUCED REACTIONS ON ~(63)Cu IN ENERGY REGION 3～55 MeV

A set of proton optical potential parameters for E≤55 MeV is obtainedon the available experimental data of ~(63)Cu and neighbour nucleus ~(62)Niand ~(64)Zn,and all cross sections of proton induced reactions on ~(63)Cu are calcu-lated.The calculated results are compared with experimental data.     

STUDY ON RESIDUES OF ~（14）C－FENITROTHION IN MODEL RICE－FISH ECOSYSTEM AND FIELD RICE－FISH ECOSYSTEM

ＳＴＵＤＹＯＮＲＥＳＩＤＵＥＳＯＦ~（１４）Ｃ－ＦＥＮＩＴＲＯＴＨＩＯＮＩＮＭＯＤＥＬＲＩＣＥ－ＦＩＳＨＥＣＯＳＹＳＴＥＭＡＮＤＦＩＥＬＤＲＩＣＥ－ＦＩＳＨＥＣＯＳＹＳＴＥＭＺｈａｎｇＺｈｏｎｇｌｉａｎｇ（张仲良）；ＷａｎｇＨｕａｘｉｎ（王化新）；Ｇ?..     

STUDY ON LUNG DOSE FOR DIFFERENT ANIMALS BY INHALATION OF SHORT－LIVED RADON DAUGHTERS

ＳＴＵＤＹ　ＯＮ　ＬＵＮＧ　ＤＯＳＥ　ＦＯＲ　ＤＩＦＦＥＲＥＮＴ　ＡＮＩＭＡＬＳ　ＢＹ　ＩＮＨＡＬＡＴＩＯＮ　ＯＦ　ＳＨＯＲＴ－ＬＩＶＥＤ　ＲＡＤＯＮ　ＤＡＵＧＨＴＥＲＳＬｉＳｕｙｕｎ，ＺｈａｎｇＳｈｅｎｇｈｕｉａｎｄＨｏｕＨａｉｑｕａｎ（Ｃｈｉｎａ...     

AN INAA STUDY ON SOIL BACKGROUND VALUES OF U,Th AND REE IN CHINA

The background values of elements in soil have been investigated by INAA. The contents of 8 REE (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu), U and Th in 364 top soil samples (A horizon) in China were determined by INAA. The samples were collected from some typical areas in China and covered main soil types of these areas. The background values of above elements in soil of the different areas and the whole soil studied in China are reported in present paper. The distribution characteristics of REE, U and Th in soils are also discussed.     

A STUDY OF THE HELIUM IMPLANTED INTO HR-1 STAINLESS STEEL BY PROTON ELASTIC SCATTERING

Small discs of type HR- 1 austenitic steel (OCr17Ni14MnMo) have been irradiated with 30-170 keV He+ for doses 1015- 1×1018/cm2 at 300K. 2.5 MeV enhanced proton backscattering, TEM, SEM and CEMS are used to investigate the He trapping, bubble structures and the phase stability. It is found that a maximum He concentration of -28 at. % was obtained after implantation with 70 keV He+ at a dose just below critical. The micro- Vickers hardnesses of irradiated layers decrease with increasing dose, particularly when dense bubbles formed. The isomer shift of CEMS increases in the negative direction after irradiation. The austenite is believed to be stable against radiation induced martensitic transformation.     

用扫描质子探针与中子活化分析方法研究微量铂赋存状态

用中子活分分析确定四川新街铂矿的矿化特征，用扫描质了探针作铂的微区分布研究。首次在该矿原位找到微米粒度的砷铂矿物。结果表明，新街铂矿为富铂钯型铂矿。微量铂主要以砷铂矿物独立存在。     

分子活化分析法研究地质样品中铂族元素的化学种态

用化学逐级溶解、镍流火试金项富集及中子活化分析法研究了中国东部大陆地幔橄榄岩捕掳体中铂族元素的化学种态。分析结果表明，6个物相中单个铂族元素的质量分数加和与铂话元素总量分析结果基本相符；硫化物相中铂话元素分布特征的研究，进一步说明了硫化物的熔出是部分熔融过程中地幔橄榄岩铂族元素分异的重要机制之一。     

中子活化分析法测定巴彦淖尔盟地区环境水中As的种态及微量元素

用萃取－共沉淀法和中子活化分析法联合测定了水中总砷、Ａｓ（Ⅲ）和Ａｓ（Ⅴ）的质量浓度。验证了方法的精密度和准确度。给出了方法的最低探测限：０．０２μｇ／Ｌ。用该方法测定了巴彦淖尔盟地区环境水中Ａｓ的种态和微量元素。分析了地砷病与水中砷的质量浓度的关系。     

中子活化分析法研究达拉布特蛇绿岩中超镁铁质岩的地球化学特征

用预浓集中子活化法测定了达拉布特蛇绿岩中超镁铁质岩中的稀土元素（REE），用仪器中子活化法测定了其中的过渡金属元素。依据测定结果分析了过渡金属及REE的地球化学特征。认为，二辉橄榄岩X12可能代表原始地幔的化学成分；二辉橄缆岩X10，X11和含矿的纯橄岩X17，方辉橄榄岩X18为上地幔经历了部分熔融后残留的地幔物质；不含矿的纯橄岩X8和异剥橄榄岩X7，X9为自镁铁质熔融体在上地幔内以堆晶作用形成的超镁铁质岩类。     

冠醚在Rb和Re中子活化分析中的应用研究

研究了用１８－冠－６（１８Ｃ６）和苯并１５－冠（Ｂ１５Ｃ５）的硝基苯溶液分别从给定ｐＨ范围的苦味酸水溶液或ＫＯＨ溶液中定量萃取Ｒｂ和Ｒｅ，同时研究了影响定量萃取的各种因素以及定量反萃的实验条件，用斜率确定冠醚与金属离子在溶液中生成２：１配合物，冠醚的选择性定量溶液萃取已较好地诮于中子活化分析岩石中微量Ｒｂ和Ｒｅ。     

用中子活化前组分离的方法测定地质标样中希土元素

前言地质样品中希土元素的中子活化分析已有许多文献报导,一般是活化以后对样品进行化学处理,使希土和干扰放射性核素分离。为了消除轻希土对重希土的干扰,有些作者还作轻重希土之间的进一步分离。活化后处理样品的缺点是放射性强,测定半衰期较短的核素时更是如此,另外在铀含量高的样品中,由于裂变产物的生成阻止了La,Ce及Nd等元素的准确测定,所以也有不少作者采用照射前处理样品的方法。     

中子活化法研究砷中毒病区人发中微量元素的分布

应用中子活化分析法测定了地方性砷中毒病区病人头发中23种微量元素的质量分数,并与北京健康人发中微量元素的质量分数进行了比较。结果表明:As,Fe,REE,Ba,Br,Sb在重病患者发中的质量分数最高,轻病患者次之,正常人最低;而Se,Ca在健康人发中的质量分数最高。用t检验方法比较这三组之间人发中微量元素的差异,发现上述元素在三组中,人发之间均存在明显差异(P<0 05或P<0 001)。并且头发中As质量分数越高,病人病情越严重。Fe,REE和Ba等微量元素可能加重砷的中毒,而Se,Ca和Co可能拮抗砷的毒性。     

中子活化分析参量化的进一步研究 Ⅲ.不同几何下Ge探测器全能峰效率的参量法归一

对于定量描述Ge探测器全能峰效率与测量几何关系的“有效作用深度”原理(EID)进行了系统的研究。首次说明了该原理的适用范围和准确度,并将其实用于堆中子活化分析中不同测量几何下全能峰效率的参量法归一。     

离子交换色层法分离和富集水中微量有机胂

研究了用阳离子交换色层法分离和富集水中甲基胂酸（ＭＭＡ）和二甲基胂酸（ＤＭＡ）的实验条件。对样品的吸附酸度、淋洗液的组成及淋洗速度进行了选择。在吸附酸度ｐＨ＝ ２ 条件下,用６０ ｍ Ｌ０．５ ｍ ｏｌ／ＬＣＨ３ＣＯＯＨ－ＣＨ３ＣＯＯＮＨ４（ｐＨ＝ ４．７）洗脱ＭＭＡ,继续用６０ ｍ Ｌ ３ｍ ｏｌ／ＬＮＨ３·Ｈ２Ｏ洗脱ＤＭＡ,淋洗速度控制在０．１～０．１５ ｍ Ｌ／ｍ ｉｎ,洗脱液用中子活化法进行测定。实际水样的加标回收率：ＭＭＡ为（９６±２）％ ,ＤＭＡ为（１０３±３）％ ,它们的相对标准偏差分别为６％ 和３％ 。