煤,煤灰,煤渣及土壤中^210Pb的测定

研究了煤、煤灰、煤渣和土壤样品中＾２１０Ｐｂ的测定方法，分析程序主要包括ＨＣｌ浸取，阴离子交换分离，ＰｂＳ沉淀纯化和＾２１０Ｂｉ测量。分析１０ｇ煤时，检测限为７．６×１０＾－４Ｂｑ／ｇ；分析５ｇ煤灰，煤渣或土壤时，检测限均为１．５×１０＾－３Ｂｑ／ｇ。测得煤、煤灰、煤渣和土壤样品中＾２１０Ｐｂ含量分别为０．０３１６±０．００９７、０．０７１２±０．０７６０、０．０１０９±０．００３５和０．０３５５     

EDXRF法测定人发中Ca,Fe,Cu和Zn的含量

本文介绍了国产管激发能量色散Ｘ射线荧光分析仪同时测定人发中Ｃａ、Ｆｅ、Ｃｕ和Ｚｎ的分析方法。该方法采用在人发样品中加入内标元素Ｙ，用化学法溶解人发，制成分析试样，用Ｘ射线荧光分析仪测定试样中的上述元素。此方法对这４种元素的检测限依次为７×ｌ０￣（－６）、ｌ×１０￣（－６）、４×１０￣（－６）和３×１０￣（－６），其变异系数分别为６％、ｌ％、２％和２％。     

氧化钆中稀土和非稀土杂质元素的ICP—AES法测定

本文介绍了电感合等离子体原子发射光谱法测定氧化钆中１８种元素，经对元素光谱干扰和基体效应的探讨发现，当溶液中氧化钆浓度为５ｍｇ·ｍＬ＾－１时，本法测定下限在６×１０＾－５～１×１０＾－３μｇ（ｇ·Ｇｄ２Ｏ３）＾－１之间。加入回收率在８２％－１０９％之间；相对标准偏差优于±６．９％。     

中子活化岩石样品中^88Y含量的测定：单纯形优化比色条件的应用

在铜－邻菲罗啉－乙醇水溶液中，采用单纯形最优化方法选择出偶氮氯膦Ⅲ与钇的最佳显色条件。在实验条件下，钇的摩尔吸收系数为１．０６×１０＾４ｍ＾２ｍｏｌ，且在０－０．６ｍｇ／ｌ范围内服从比尔定律，变异系数为０．８７％。用此方法测定了中子活化岩石样品＾８８Ｙ的化学回收率。     

大射野,大深度^60Coγ射线照射条件下组织—空气比的公式计算

本文利用＾６０Ｃｏγ放射源和７２ｃｍ×７２ｃｍ×９０ｃｍ（长×宽×高）体模，在大射野（１０．０ｃｍ×１０．０ｃｍ～５０．ｃｍ×５０．０ｃｍ）和大深度ｄ（１０．０～７０．０ｃｍ）照射条件下实测的组织－空气比数据，按Ｍｅｌｓｋｉ计算＾６０Ｃｏγ射线组织－空气比深度函数公式，Ａｅ＾Ｂｄ＋Ｃｅ＾Ｄｄ，利用高斯－牛顿逐次逼近的计算方法，拟合出该公式参数Ａ，Ｂ，Ｃ和Ｄ的最佳估计值，５组数据的残差平方和小于１．     

新丰中子核素^185Hf的研究：Ⅰ.合成,分离和鉴别

用（ｎ，２ｐ）反应和快化分离法首次合成和鉴别了新丰中子同位素＾１８５Ｈｆ。其半衰期为３．５±０．６ｍｉｎ。另外，还观察到一条能量为１６４．５±０．５ｋｅＶ、半衰期为４．３±０．９ｍｉｎ的属于＾１８５Ｈｆ衰变的ｒ射线。     

北京HI—13串列加速器质谱计测定^36Cl的研究

描述了中国原子能科学研究院的基于ＨＩ－１３串列加速器建立的加速器质谱计装置和测定＾３６Ｃｌ的实验方法。利用这台加速器质谱计测定＾３６Ｃｌ／Ｃｌ同位素原子比值的灵敏度已好于３×１０×－１５，对地下水，盐湖和铀矿石样品中的＾３１Ｃｌ进行了测定，这些样品的＾３６Ｃｌ／Ｃｌ同位素比为１．２×１０×－１２－２．２×１０＾－１４。     

煤、煤灰、煤渣及土壤中￣210Pb的测定

研究了煤、煤灰、煤渣和土壤样品中￣２１０ｐｂ的测定方法，分析程序主要包括ＨＣｌ浸取、阴离子交换分离、ＰｂＳ沉淀纯化和￣２１０Ｂｉ测量。分析１０ｇ煤时，检测限为７．６×１０￣（￣４）Ｂｑ／ｇ；分析５ｇ煤灰、煤渣或土壤时，检测限均为１．５×１０￣（￣３）Ｂｑ／ｇ。测得煤、煤灰、煤渣和土壤样品中￣２１０ｐｂ含量分别为０．０３１６±０．００９７、０．０７１２±０．０７６０、０．０１０９±０．００３５和０．０３５５±０．０１７３Ｂｑ／ｇ，对应的化学回收率依次为９５．１％±２．５％、９７．２％±２．０％、９３．５％±１．６％和９５．７％±１．５％。和煤中￣２１０ｐｂ含量相比，煤灰中￣２１０ｐｂ的浓集因子在１．６０－１１．８的范围。     

高能（MeV级）氧离子注入本征型GaAs的电性能及注入损伤退火行为的研究

在本征型ＧａＡｓ中注入２．０ＭｅＶ（剂量１．０×１０＾１５／ｃｍ＾２）＋２．９ＭｅＶ（剂量１．１×１０＾１５／ｃｍ＾２）的＾１６Ｏ，使氧在约１．５－２．５μｍ之间形成均匀分布。注入样品分别经４００－８００℃、１５ｍｉｎ热退火后的电阻率测量表明，经５００℃和６００℃退火后的样品具有高的电阻率（～１０＾８Ω·ｃｍ）；而当退火温度进一步升高时，其电阻率逐渐下降，并具有ｐ型导电行为。沟道ＲＢＳ分析表明，当     

同位素稀释质谱法测定气体样品中微量氦氖氩

介绍了同位素稀释质谱法（ＩＤＭＳ）定量分析地下气体样品中的微量氦氖氩。介绍了稀释剂配制、标定、稀释剂与待测样品混合和同位素比值测量技术并进行了实验结果的误差分析。结果表明：体积分数为１０￣（－６）、１０￣（－５）、１０￣（－４）时，不确定度分别约为±３％、±２％、±２％。     

Stopping powers of Be,Al, Ti,V, Fe,Co, Ni,Cu, Zn,Mo, Rh,Ag, Sn,Ta, Pt and Au For 6.5 MeV protons

The stopping powers of Be, Al, Ti, V, Fe, Co, Ni, Cu, Zn, Mo, Rh, Ag, Sn, Ta, Pt and Au for 6.5 MeV have been measured using a surface barrier silicon detector. The accuracy of the results is ± 0.3%. The detail of the experimental procedures is described. The results have been compared with the Risø data and the Aarhus data of Andersen et al. The present results for Al, Cu and Ag agree very well with the Aarhus results at 6.5 MeV. The mean excitation energy has been extracted from the present results using the Bonderup shell correction, the Barkas correction and the Bloch correction. The parameters x and b which appear in the Bonderup shell correction and the Barkas correction have been newly determined as x = 1.358 and b = 1.3. The present mean excitation energy agrees very well with the I values obtained by other authors. It has been confirmed that the Bonderup shell correction is quantitatively correct for 6.5 MeV protons.     

Wavelengths,transition probabilities,and oscillator strengths for M-shell transitions in Co-, Ni-, Cu-, Zn-, Ga-, Ge-, and Se-like Au ions

Wavelengths, transition probabilities, and oscillator strengths have been calculated for M-shell electric dipole transitions in Co-, Ni-, Cu-, Zn-, Ga-, Ge-, and Se-like Au ions. The fully relativistic multiconfiguration Dirac–Fock method, taking quantum electrodynamical effects and the Breit correction into account, was used in the calculations. Calculated energy levels of M-shell excited states for Cu-, Zn-, Ga-, Ge-, and Se-like Au ions from the method were compared with available theoretical and experimental results, and good agreement with them was achieved.     

Measurements of the total effective cross sections for resonance neutrons in Pd,Os, Ir,Mo, In,I, Ta,Th, U238

The results of calculations of the level constants in the elements Pd, Os, Ir, Mo, I, In, Ta, Th, U²³⁸ are presented; the cross sections for these elements have been published earlier. New measurements for the cross sections in Ir, Th, U²³⁸ are cited. The measurements were made with a mechanical-chopper spectrometer with a resolution of 0.08 sec/m in the energy region from 4.5 to 10,000 ev. The integrated and differential curves for the distribution of neutron widths in these elements are plotted.Presented at the International Conference on Nuclear Reactions in Amsterdam (June 1956).The authors take this opportunity to express their gratitude to U. Chi-Kwa and Suan Chi-Ling for their assistance in the mathematical analysis of the experimental results, G. M. Kukavadze for the mass-spectro-graphic analyses of the samples, V. N. Bovinoi and M. P. Anikinoi for providing the chemical analyses and A. I. Ermakov, N. S. Rezvyakov, G. V. Rukolaine and K. A. Trostinoi for help in building the analyzer and in carrying out the measurements.     

Discovery of dysprosium,holmium, erbium,thulium, and ytterbium isotopes

Currently, thirty-one dysprosium, thirty-two holmium, thirty-two erbium, thirty-three thulium, and thirty-one ytterbium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.