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      • Shanggeng Luo
        Vol. 13, Issue 1, (1990)
        摘要：This paper describes the significance of incineration treatment for radioactive wastes, incineration process, design principle and developing tendency. The R and D activities in China in this field are also discussed.  
        关键词：Combustible wastes;Volume reduction;Incineration technology   
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        发布时间：2022-08-16
      • Huansheng Cheng,Diechi Sun
        Vol. 13, Issue 1, (1990)
        摘要：As-implanted silicon wafers are irradiated transiently using a large area low energy electron beam. The results on sheet resistivity and RBS/channeling experiment indicate that the electrical activation of the dopants is almost 100% complete. In contrast with the conventional furnace annealing, better recovery of the implantation damage is obtained and the dopant redistribution is weakened.  
        关键词：Ion implantation;Electron beam annealing;Channeling effect   
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        发布时间：2022-08-16
      • Guanghou Wang,Mingkang Teng,Dexun Shen,Yongyi Zhou,Yongyi Lu,Qiji Lai,Houwen Wang,Yongxing Jiang
        Vol. 13, Issue 1, (1990)
        摘要：Positron annihilation lifetime spectra and Doppler broadening are used to investigate high energy (12MeV) electron-irradiated polyethylene and polypropylene. With increase of the electron dose less than 160kGy the short lifetime component of positrons for PP becomes longer while the intensity of the medium lifetime component decreases. When the irradiation dose reaches 320 kGy the lifetime components in the irradiated-PP are similar to those in virgin samples. However, the intensity of the longest lifetime component is nearly unchanged with increase of the irradiation dose. In the irradiated-PE both intensity of the longer lifetime component and shape parameter of Doppler broadening decrease quite a bit at the beginning but remain constant after 80 kGy electron irradiation. The mechanisms of different effects of high energy electron irradiation on the two polymers are discussed.  
        关键词：Electron irradiation;Polyethylene;Polypropylene;Positron annihilation lifetime   
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        发布时间：2022-08-16
      • Guohuan Dai,Qisheng Liu,Jian Fu,Jiying Sun
        Vol. 13, Issue 1, (1990)
        摘要：The parts concerning input and output statements of the original POSITRONFIT program were largely added, modified and readjusted to meet the needs of the PC-DOS operating system. The POSITRONFIT program was compiled successfully by using IBM/PC FORTRAN Compiler V2.00 and IBM Professional FORTRAN Compiler V1.14. The real variables in the program were all expressed by 8 bytes of double precision ones and the precision was better than that on B6700 or IBM370. The typical computational time is 100 seconds, which is a little longer than that on B6700 computer.  
        关键词：IBM series computer;PC-DOS operating system;Edition program   
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        发布时间：2022-08-16
      • Deyuan Tian,Di Jia,Shuyi Chen,Yong Zhou
        Vol. 13, Issue 1, (1990)
        摘要：This paper details the result of the first radon measurement intercomparison exercise for scintillation cells in our nationwide health system which was held in 1986. Ten instruments participated in the intercomparison. The logarithmic linear regression equation of each instrument can be shown as 1nC(Rn)=3 + 1nn. The field intercomparison was performed. All the data agreed very well among the participants.  
        关键词：Radon;Scintillation cell;Calibration;Intercomparison;Logarithmic linear regression   
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        发布时间：2022-08-16
      • Zhutang Wen,Riyou Luo,Lin Gao,Yu Li
        Vol. 13, Issue 1, (1990)
        摘要：Our studies show that for dichromate solution/Ag+ dosimeters in the 10—40 kGy range the response to dose is in good linearity, and the effects of dose rate and temperature during irradiation on absorption dose response could be negligible. Furthermore, the dosimeter solutions have good storage stability before and after irradiation. So long as the preparation of dosimeters and the measuring procedure are well controlled, the precision of the system can reach to about 1%, and total uncertainty to ±3.5%. The system can be used as transfer standard dosimeters for high-dose measurement.  
        关键词：Absorption dose;Transfer standard   
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        发布时间：2022-08-16
      • Pengji Zhai,Tiesheng Kang
        Vol. 13, Issue 1, (1990)
        摘要：This paper describes annealing characteristics of 208Pb and 93Nb ion tracks in Chaoyang No.1 polycarbonate, including the effect of annealing temperature on track etching rate and the effect of annealing temperature and annealing time on annealing rate. The result shows that activation energy of annealing for 208Pb and 93Nb in Chaoyang No.1 polycarbonate is 0.891 eV and 0.352 eV respectively.  
        关键词：Polycarbonate;Heavy ion track;Annealing   
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        发布时间：2022-08-16
      • Youtong Wang
        Vol. 13, Issue 1, (1990)
        摘要：Mössbauer spectra of nitrogen model compounds with double-cubane configuration (Et4N) 4[Mo2Fe7S8 (sph) 12] have been measured. The data have been fitted successfully with a least-squares fitting computer program. The Mössbauer parameters measured at 16℃ are as follows. For FeI, δ=0.315±0.002mm/s, ∆EQ=0.691±0.002mm/s and the line width is 0.304±0.002mm/s; For FeII, δ=0.972±0.002mm/s, ΔEQ=1.741±0.002mm/s and the line width is 0.273±0.002mm/s. The isomer shift δ is relative to α—Fe. The ratio of quadrupole split areas for FeI and FeII is about 6:1. From these parameters it is found that FeII is in +2 high spin state. Using an empirical formula about the isomer shift δ and the mean oxidation state s of Fe atoms in tetrahedron FeSI:d=1.44-0.43s, we have deduced that FeI is in +2.67 high spin state.  
        关键词：Double-cubane;Nitrogen fixation compounds;Mossbauer spectroscopy   
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        发布时间：2022-08-16
      • Huazhong Yang,Hengxin Hao,Chengde Gong
        Vol. 13, Issue 1, (1990)
        摘要：The reason why Si (Au) detectors deteriorate when rebiasing after exposed to a fast neutron flux up to 1013n/cm2 is studied experimentally. By slowly applying the bias, the performance of the detectors could be recovered and their service life be prolonged.  
        关键词：Fast neutron fluence;Irradiation;Bias;Detectors   
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        发布时间：2022-08-16
      • Jing Jia,Zengzhi Zhang,Genchang Li,Chongquan Zhu
        Vol. 13, Issue 1, (1990)
        摘要：Yields of neutron generators have been measured by the iron foil neutron activation method and a long counter separately. The methods and results are given.  
        关键词：Neutron generator;Yield;Neutron flux density   
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        发布时间：2022-08-16
      • Jian Zhou
        Vol. 13, Issue 1, (1990)
        摘要：Stability of artificial synthetic overweight elements has been analysed theoretically using a diagram of nuclear stability. It is indicated that overweight nucleus can be synthesized only when a certain amount of neutrons participate simultaneously in the synthesis. The maximum number of protons in overweight elements is 1002. The proton number of "extreme overweight" elements of which the neutron star is possibly composed is in the range from 326 to 1002. It is expected that the mass number of the stable overweight elements with proton number 114 is in the range from 299 to 315.  
        关键词：Overweight nucleus;Artificial synthesis;Neutron star   
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        发布时间：2022-08-16
      • Zhijie Yu,Fuxing Jia,Jingli Shi,Kunrong Zeng,Yuyuan Xie
        Vol. 13, Issue 1, (1990)
        摘要：Prussian blue (PB) can enhance elimination of 134Cs in rat and 137Cs in human subjects, not only in early period but also in late period. When each rat was given orally 50 mg/kg of PB, the total elimination rate of 134Cs in 72 hours was 53.9%, When the rat received orally 500 mg/kg of PB each day which lasted for 6 days, the total elimination rate of 134Cs in 7 days was 94.3%.The toxicity of PB was quite low. The doses as high as 40—800 times of 50mg/kg PB did not cause any acute and early toxic effects on mice, rats and dogs.  
        关键词：Prussian blue(PB);Radiocesium;Internal exposure   
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        发布时间：2022-08-16
      • Weizhen Gao,Fang Chen,Yuping Li,Shizhen Wang,Liyi Lu
        Vol. 13, Issue 1, (1990)
        摘要：A technetium-chelating agent, mercaptoacetylglycylglycylglycine (MAG3), was synthesized and chelated with 99mTc. Animal studies of 99mTc-MAG3 indicated that it excretes faster than o-iodohippurate (OIH) both in normal and in probenecid treated animals.  
        关键词：Renal function imaging agent;Technetium-99m - MAG3   
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        发布时间：2022-08-16
      • Min Liu,Gaohong Feng,Xilin Cai
        Vol. 13, Issue 1, (1990)
        摘要：Corydalis amabilis Migo total alkaloids (COAMTA), isolated from the root of Corydalis decumbens (Thunb) Pers, possessed inhibitory action on ADP-induced blood platelet aggregation and the formation of thrombus in animal experiments. Its effects on the platelet cyclic AMP and cyclic GMP in incubated rabbit platelet were measured by radioimmunoassay.cAMP was significantly elevated when COAMTA was given 0.08—0.16mg/ml PRP. In concentration up to 0.16 mg/ml PRP, COAMTA elevated cGMP, but the ratio value of cAMP/cGMP was much higher than that of control group. These results suggest that the anti-platelet activity of COAMTA were mediated through elevation of cAMP levels.  
        关键词：Corydalis amabilis Migo;cyclic AMP;cyclic GMP;Plateletrich plasma   
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        发布时间：2022-08-16
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