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      • Xilei Lin,Wenhua Zhang
        Vol. 09, Issue 10, (1986)
        摘要：Starting with the operation of probable events, the cascade-coincidence effects with complex decay scheme are investigated in detail. Multi-cascade decay, branching decay and summing events are considered seperately, and hereafter the general formulae for calculations of the coincidence factor, the summing factor and the combined coincidence factor are derived. These formulae can be used for correction of γ-counting of radionuclides with complex cascade decay schemes.  
        关键词：cascade coincidence;γ-counting   
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        发布时间：2022-09-13
      • Tingjin Liu,Renqiu Liu
        Vol. 09, Issue 10, (1986)
        摘要：The processing of observed data for the same physical quantities are often met in nuclear data evaluations or measurements. When the data are statistical consistency, they can be easy processed with statistical method, but when the systematic error exists, the processing is quite difficult. For this reason an universally useful method has been developed. According to the method, a prior covariance matrix of systematic error must be given, and then the average value and its error can be calculated. The weighted average value, arithmatical average value and internal error, external error and arithamatical average error are a specific case of this method. A program has been made, the results show that the method is reasonable.  
        关键词：systematic error;Data processing;process program;nuclear data evaluation   
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        发布时间：2022-09-13
      • Dazhen Jiang,Genbao Liu,Jingqing Yang,Yinji Zhang,Jianjun Xu
        Vol. 09, Issue 10, (1986)
        摘要：The off-line analysis of multiparameter experimental data based on ND620 was presented. The language was FORTRAN-77 used on PDP11 series computers. The method of particle discrimination and background subtraction of two-dimensional spectrum were discussed.  
        关键词：ND620 system;particle discrimination;Background subtraction;Program design   
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        发布时间：2022-09-13
      • Yongming Lou,Binglin Gu,Naifei Gao,Jiajiong Xiong
        Vol. 09, Issue 10, (1986)
        摘要：The positron lifetimes for voids are related with the effective volume of the voids of some metals from the theoretical points of view. By means of the density functional formalism and local density approximation, the positron annihilation lifetime for voids of various sizes in the metal have been calculated systematically. It is shown that the positron annihilation technique is a powerful method for investigating the structure of the defects in metal.  
        关键词：Vacancy;Void;Positron lifetime   
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        <引用本文> <批量引用> 29835951 false
        发布时间：2022-09-13
      • Yunlong Qian
        Vol. 09, Issue 10, (1986)
        摘要：A double focusing, non spatial dispersion magnet design has been suggested to substitute the achromatic principle for improving the beam characteristics on target of the medical accelerator. The influences of reducing the distance between the target and magnet exit and the effect of changing injection angle of the magnet have been discussed to obtain the more compact deflecting magnet.  
        关键词：double focusing;non spatial dispersion;achromatism;deflecting magnet;Medical accelerator   
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        发布时间：2022-09-13
      • Ruqin Chang,Guiqin Xu,Huijuan Jin,Baojin Zhang,Min Hu
        Vol. 09, Issue 10, (1986)
        摘要：A cryogenic assembly of Mössbauer spectrometer is introduced. Its applicable temperature range is from 77K to 300K. The temperature controlling precision is ±0.1K and the temperature measuring precision is ±0.6K. The capacity of Dewar container is two liters. The consumptions of liquid N2 are 0.05 1/h and 0.14 1/h at 77K and 273K respectively. This cryogenic assembly is sufficiant to meet the demands of Mössbauer spectrum measurement.  
        关键词：Mössbauer;cryostat   
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        发布时间：2022-09-13
      • Xiqi Li,Guizhang Ni
        Vol. 09, Issue 10, (1986)
        摘要：This paper describes a measuring test for compacting performance of YZJ-19A type vibratory roller by using MC-2 type nuclear moisture/density gauge. The conditions of PR compacting factor>95% on loam are V=2.0km/h, f=25Hz, A=3.3mm, N>4 for YZJ-19A type roller. Thus, a nuclear determining method is provided.  
        关键词：surface nuclear moisture/density gauge;vibratory roller;Proctor compacting factor   
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        发布时间：2022-09-13
      • Chunhua Zhang,Qing Wang,Anzhi Cui,Yonghui Liu,Xiuzhi Wang,Sujing Zhang,Linkun Qi,Shuying Sun,Conggui Liu,Peijia Tang
        Vol. 09, Issue 10, (1986)
        摘要：This paper described a method of determining relationship among the β-counting efficiency, β-average energy and thickness of the sources. It can be applied to estimating counting efficiency of any β-source with known β-average energy.  
        关键词：counting efficiency;Calibration;average energy   
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        发布时间：2022-09-13
      • Xinlei Ni,Shujun Zhao,Kezun Xu,Fang Zhang
        Vol. 09, Issue 10, (1986)
        摘要：The fundamental parameter method in radioisotope X-ray fluorescent analysis is used to analyse the composition of the alloy non-destructively. The secondary and the tertiary fluorescent X-ray intensities were considered in the calculation. A computer program for the fundamental parameter method was complied to correct the absorption effect and the enhancement effect. Cu-Zn alloy, bronze alloy and low alloy steel specimens were analyzed by this method. The results agree with the known values as well as the analyzed values by chemical method and atomic absorption method.  
        关键词：radioisotope source;Fundamental parameter method;Non-destructive analysis;secondary and tertiary fluorescent X-ray intensities   
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        发布时间：2022-09-13
      • Guisun Zhuang,Yinsong Wang,Mingguang Tan,Min Zhi,Yuanxun Zhang,Yuandi Cheng
        Vol. 09, Issue 10, (1986)
        摘要：This paper describes the determinations of As, Se, Cu and Zn in biological materials by RNAA. The trace elements are separated from interfering activities by distillation, solvent extraction with NaDDTC and anion exchange with DOWEX 1×8. The samples and standards are irradiated at a thermal neutron flux of 7.5×1013n/cm2 • s for 65h and separated after decay of 3—4 days. The reliability of the method is checked with NBS-1577 IAEA-H8 and NIES-5. Most of the results are in agreement with values certified in the interlaboratory study.  
        关键词：RNAA;biological materials;As;Se;Cu;Zn   
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        发布时间：2022-09-13
      • Borong Bao,Yuanxian Xia,Yanfei Li,Luona Chen
        Vol. 09, Issue 10, (1986)
        摘要：A method for the determination of relative amounts of 233U and 232U has been developed. Uranium solution obtained from neutron irradiated ThO2 was further purified and prepared into a thin source. α-spectra of 233U and 232U were determined by Au(Si) detector and multichannel analyser.  
        关键词：Th;232U/233U ratio;determination of α-spectroscopy   
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        发布时间：2022-09-13
      • Zhixian Zhao,Chunrong Yu
        Vol. 09, Issue 10, (1986)
        摘要：An irradiation facility with 3.7×1014 Bq of 60Co for textile research was constructed adopting the form of underwater irradiation and making use of used radiation sources. The facility is simple in structure, and easy to operate witn low building costs. The effective irradiation space is a cylinder of ϕ225×250mm, in which irradiation uniformities (Dmax/Dmln) range in 1.28—1.40, 1.17—1.30 and 1 respectively. It is suitable for irradiation of samples of various materials and for scientific experiments.  
        关键词：underwater irradiation;used radiation sources;source array;dose rate distribution;textile research   
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        发布时间：2022-09-13
      • Meifen Xu,Weijie Xu,Guizhen Wang,Houjun He
        Vol. 09, Issue 10, (1986)
        摘要：The following results were obtained when dry seeds of wheat Var. Zhemai No.1 and M588-1 were exposed to 20, 30 and 40 krad of gamma irradiation from both 137Cs and 60Co sources at a dose rate of 150 rad/min with seeds treated with 60Co gammaray as control. The morphological injuries and physiological damages in M1 appeared to be serious with increasing dose, however the responses of the varieties were different to the sources. There was a significantly negative correlation between the single plant yield and the dose exposed, the coefficient for Var. M588-1 was -0.9886, while Zhemai No.1 was -0.9314. Results obtained through path coeficient method showed that the reduction of single plant yield was mainly caused by the decrease of effective panicle number. Dry wheat seeds irradiated with different sources resulted in plant morphological alternation and cytological changes. The rate of chromosomal aberration and micronuclei number were increased as the seeds received dose more. The coefficient between radiation dose and micronuclei rate reached 0.9726.  
        关键词：137Cs;dry seeds of wheat;Radiation effects;cytological analysis   
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        发布时间：2022-09-13
      • Xiushan Zhu,Fuquan Liu,Lingyun Zhou,Junsheng Tong
        Vol. 09, Issue 10, (1986)
        摘要：The tussah cocoons have been treated by γ irradiation to control the pupae development and prolong their preservation period. As compared with the conventional hot steam killing method, it could save energy, cost and improve the quality of silk or cocoons.The experiment showed that the tussah pupae in dormant or pre-blackening period were irradiated by the dosage of 2×104R or more, their respiration strength weakened, glycogen consumption decreased and all the metabolisms were inhibited.If the dormant pupae were irradiated by 8—12×104R γ ray, they can be preserved two months longer in ordinary temperature than the controlled. The unraveling technology and silk quality analysis of the tussah cocoons irradiated by 2—25×104R γ ray keep unchanged as compared with the controlled.  
        关键词：60Co γ ray irradiation;tussah cocoon;inhibition   
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        发布时间：2022-09-13
      • Jun Fang,Bin Gong,Qizhong Mo,Xuping Qian,Jumei Wang,Xingwei Kuang,Rong Chen,Baihui Wu
        Vol. 09, Issue 10, (1986)
        摘要：This paper describes iodine labelled radioimmunoassay for the cyclic GMP. Preparations of antigen, antibody and radioligand are described. A second antibody separation of simple high sensitivity method for the assay of cyclic GMP is presented.The cross-reactivity of this cyclid GMP antiserum with cyclic AMP and GTP are 0.008% and 3.1×10-3% respectively.Sensitivity of the method is 1.5 fmol cyclic GMP per tube. Recovery of the method is 104.0±4.7% and variety coefficient in batch is 2.8%.Cyclic GMP content in the plasma of normal man is 4.60±0.70 pmol/ml.  
        关键词：125-iodine labelled radioimmunoassay;determination of cyclic;GMP   
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        发布时间：2022-09-13
      • Bingchai Zhu,Baoyi Liu
        Vol. 09, Issue 10, (1986)
        关键词：maintenance workers of nuclear reactor;chromosome;aberration   
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        发布时间：2022-09-13
      • Lianzhong Liang
        Vol. 09, Issue 10, (1986)
        摘要：liquid scintillation quench microprocessor technology  
          
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        发布时间：2022-09-13
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