最新刊期
      卷 0 ， 期 0 ， 2020
      • Jiarui Nie,Xiuqin Li,Chunjian He
        Vol. 12, Issue 5, (1989)
        摘要：The nuclear magnetic resonance has become a powerful means of studying biological metabolism in non-invasive and non-destructive way. Being used to study the metabolic processes of living system in normal physiological conditions as well as in molecular level, the method is better than other conventional approaches.Using important parameters such as NMR-chemical shifts, longitudinal relaxation time and transverse relaxation time, it is possible to probe the metabolic processes as well as conformation, concentration, transportation and distribution of reacting and resulting substances. The NMR spectroscopy of 1H, 31P and 13C nuclei has already been widely used in metabolic researches.  
        关键词：Nuclear magnetic resonance;Chemical shift;Spin-lattice;relaxation time;Spin-spin relaxation time   
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        发布时间：2022-08-16
      • Qizong Qin,Adi He,Weijie Jia,Lidun Ma,Huansheng Cheng,Zhongyi Hua
        Vol. 12, Issue 5, (1989)
        摘要：High Tc superconductivity has been observed both resistively and magnetically in the new U (Th) -Y-Ba-Cu-O systems. The zero resistance temperature of the three samples with nominal composition of U0.1 Y1.1 Ba0.8 Cu O4-Z, U0.15 Y1.05 Ba0.8 Cu4-Z and Th0.3 Y0.8 Ba0.8 Cu4-Z is 87K, 79K and 74K, respectively. The result of ac magnetic susceptibility measurement implies that the superconducting state is realized in the U-doped samples below 90K. The stoichiometry of the U-Y-Ba-Cu-O superconductors has the aid of Rutherford backscattering and nuclear reaction 16O (d, p) 17O. The analytical results show that the "real composition" of samples may be different from that of the nominal composition. The X ray diffraction analysis of the U-Y-Ba-Cu-O system shows that. none of the peaks can be fitted to the uranium oxides and the other raw materiale structure, and its pattern may be attributed to new multiple phases with structure different from the known singlephase superconducting oxides.  
        关键词：Superconductivity;Zero-resistance;ac-susceptibility;Uranium   
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        发布时间：2022-08-16
      • Chuanpeng Wang,Jiading Zhang,Tingwen Rong,Xiaofeng Lu,Qixun Sun,Weiyu He,Zhaoyi Zhao,Zongzhi Huang,Xingen Yu,Lanping Yang,Shouqing Weng,Hongdi Zhou,Jiong Zhang,Defeng Xie,Qianmei Ji,Yunxia Lan,Bin Jiang,Binghua Xie
        Vol. 12, Issue 5, (1989)
        摘要：The production of thallous chloride 201T1 injection is described. 201T1 was produced via nuclear reaction of 203T1 (p, 3n) 201Pb. using natural thallium in a specially designed 2π cooling target system. The separation of Pb-activity from the T1 target was carried out by extraction of T1 (Ⅲ) with isopropyl ether and purification of Pb (Ⅱ) with an anion exchanger (201×8 resin) column. After a decay time of 32h, during which an optimum growth of 201T1 took place, carrier-free 201T1 was separated from the 203Pb activities by a second similar anion exchanger. Dependences of the percentage extraction of T1 (Ⅲ) from HC1 solution into isopropyl ether on acidity and concentration of T1 (Ⅲ) in aqueous phase were determined. The thick target yield of 201T1 is 18.8MBq/µAh. The product possesses a radioisotopic purity of >99% and a radiochemical purity of >98%It is a sterile, isotonic and pyrogen-free solution with a T1 content of 0.27×10-7µg/Bq.  
        关键词：Radiopharmaceuticals;Thallous chloride 201T1 injection;Anion exchange resin   
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        发布时间：2022-08-16
      • Zhongyang Wang,Yajian Liu,Zuliang Chen,Yuehong Zhang
        Vol. 12, Issue 5, (1989)
        摘要：The electron pre-irradiation of polyethylene powder and subsequent reaction with acrylic acid for modifying adhesive property of polyethylene were investigated. The dependences of melt index, gel content, surface tension and polyethylene/A1 foil adhesion on irradiation dose and acrylic acid content were measured. It was shown that adhesion between the grafted polyethylene and aluminium foil, as measured by a "180°" peel-test, reached the value of 2.45N/2.5cm. This material can be developed to produce laminate for food packing. The possible mechanism of graft modification was discussed. "H" and "T" graft models were proposed.  
        关键词：Radiation;Grafting modification;Adhesion;Polyethylene powder;PE/A1 laminate   
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        发布时间：2022-08-16
      • Shuanggui Yuan,Shuwei Xu,Tianmei Zhang,Yingxiang Guo,Li Zhang,Xiulan Ou,Manqing Liu
        Vol. 12, Issue 5, (1989)
        摘要：A semiconductor telescope spectrometer for β ray spectra and the associated program for analysis of β spectra have been built and tested. The spectrometer consists of a ΔE detector (0.3mm×200mm2 Si (Au) ) and an E detector (15mm×500mm2 Hp Ge) . Its energy resolution for single energy electrons is 20keV. Multibranch β spectra can conveniently be analyzed, and then their endpoint energies and branching ratios can be obtained by means of the program, in which the response function of the telescope has been taken into account. The endpoint energies and branching ratios for three well known β emitters, i. e. 152Eu, 90Y and 56Mn, have been extracted experimentally, which are in good agreement with published results. Since the HP Ge detector is rather thin, it can also be used as a low energy γ ray detector.  
        关键词：Semiconductor telescope;β spectra;Iterative method   
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        发布时间：2022-08-16
      • Mengping Qian,Mizhen Yang,Guoxiong Wan
        Vol. 12, Issue 5, (1989)
        摘要：Copolymers of acrylic acid with butyl acrylate have been prepared by means of adiation induced copolymerization. Obtained products may be used in film production as a new material for augmenting silver covering power, as well as for improving film mechanical properties. So that, a great deal of economical benefit can result in.  
        关键词：Acrylic acid;Butyl acrylate;Copolymer;Radiation synthetic   
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        发布时间：2022-08-16
      • Baolin Chen,Weizhong Zhou,Mei Li,Yanfei Li,Liming Zhu,Yongkang Tan,Fangdong Tang,Ruizhu Tang,Qingling Huang,Shenjia Zhuo
        Vol. 12, Issue 5, (1989)
        摘要：The calibration of a 4πγ ionization chamber is described. Some of the standard sources used for calibration are prepared by utilizing a 4πβ (PC)-γ coincidenc equipment and a Ge (Li) γ detector. The chamber has been calibrated with 26 nuclides. The overall uncertainties (3σ) of the calibration factors are in the range of 1.2%—4.6%. An efficiency curve is derived from the calibration factors for the single and two energy photon sources. It can be used to predict the calibration factors for those nuclides with which the chamber hasn't been calibrated. In general, the discrepancies between the predicted and the measured values are within ±3%. A direct measurement method has been tested and the result is satisfactory.  
        关键词：γ-ray emitting nuclides;Substandard for activity measurement;4πγ ionization chamber   
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        发布时间：2022-08-16
      • Dexun Shen,Minkang Teng,Chuanyuan Yin,Xiuji Feng,Shizong Long
        Vol. 12, Issue 5, (1989)
        摘要：Adding impurities to β-C2S can affect its microstructure, polycrystalline transfer and rate of firing reaction. Being hard dry powder. β-C2S can not be compressed into pieces, so a vertical experimental arrangement is used. The lifetime spectrum of positrons in β-C2S powder samples added with Na2O and P2O5 is studied. The results show that the component with intermediate lifetime τ2 (about 470 ps) represents the capture of positrons in Ca2+ vacancies; the intensity I2 of τ2 decteases with increasing of Na+ and increases with increasing of P5+. The results also show that Na+ replaces Ca2+ and creates anion vacancies, but P5+ creates cation vacancies.  
        关键词：Positron annihilation;β-C2S;Powder sample   
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        发布时间：2022-08-16
      • Xinding Fu,Hongli Fang
        Vol. 12, Issue 5, (1989)
        摘要：The Fresnel Au-zone plates and the multiple-pin-hole Au-foils are microfabricated using ion beam etching technique. The key points how to determine the etching rate and the relation between terrace sloping angle and etching parameters are indicated. The plates and foils so obtained have greatly improved the resolving power of the coded imaging camera and have been successfully used to measure the spacial distribution of laser plasma and to diagnose of nuclear fusion.  
        关键词：Ion beam etching;Incident angle of ion beam   
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        发布时间：2022-08-16
      • Aimin Sun
        Vol. 12, Issue 5, (1989)
        摘要：A method for cleaning radioactive contamination of plastic sample tubes for RIA was reported. Both radioactive and protein contamination in tubes can be cleaned thoroughly. The method is very effective, economic, simple and convenient. Using the method one can keep the tube's transparency and glossiness, and make the tube to be used repeatedly. The radioactive pollution to the environment and human body can also be reduced.  
        关键词：Radioactive immunology analysis;Sample tube;Cleaning method   
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        发布时间：2022-08-16
      • Hong Xu,Jiguan Wei,Jujing Zhang,Min Wang
        Vol. 12, Issue 5, (1989)
        摘要：A condition test on soil samples with four different dissolution preparations is presented. The results show that the 4 mol/l HCl-0.4 mol/l HF is an ideal dissolvent for 90Sr and 137Cs in soil samples. With the mixed acid the nuclides 90Sr and 137Cs can be dissolved by the classical method. By radiochemical analysis, the average concentration of 137Cs in soil is 18.4 Bq/kg, well in agreement with the results of 18.0 and 18.5 Bq/kg determined by the gamma spectrometry method.The chemical recovery of 90Sr and 137Cs for about 200 soil samples is more than 80%. The procedure is accurate and reliable for practical use.  
        关键词：soil samples;90Sr;137Cs;Dissolution test   
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        发布时间：2022-08-16
      • Meiyu Qiang,Limin Zhang,Jie Sun,Delin Wu,Qi Chen
        Vol. 12, Issue 5, (1989)
        摘要：Human superoxide dismutase (SOD) was labelled with high specific radioactivity by conjugating to an 125I-iodinizated acylating agent. Radiochemical purity of 125I-SOD was more than 96% and its specific activity was 0.74—1.15 MBq/µg. Radioimmunoassay showed that the tracer had a higher radioimmunoactivity. The 125I-SOD antigen was able to combine with its SOD antibody specifically. The binding rate was 56% at the antiserum dilution of 1:10000.  
        关键词：superoxide dismutase;Conjugation method;Acylating agent   
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        发布时间：2022-08-16
      • Fuping Wu,S. F. Mohammad,A. Jr. Taylor
        Vol. 12, Issue 5, (1989)
        摘要：Investigation on the possibility of radiation impairment of human platelets labelled with 111In-oxine has been described. 20 normal volunteers were divided into one high-radioactivity-labelled group (15.5±1.4 MBq) /109 platelets, n=10) and one low-radioactivity-labelled group (2.55±0.10 MBq/109 platelets, n=10) . The ADP-induced aggregability of 111In-oxine-labelled platelets in-vitro was normal and the functions of 111In-oxine-labelled platelets in vivo circulation after reinjection remained unaltered in both groups. No significant difference was found between the two groups. The results indicate that high radioactivity of 111In-oxine does not impair the platelet function.  
        关键词：111In-oxine;ADP-incuced platelet aggregation;Platelet adhesion;Platelet survival time   
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        发布时间：2022-08-16
      • Jinchang Wu,Yimin Jiang
        Vol. 12, Issue 5, (1989)
        摘要：Serum antipsychotic drug in 50 psychosis cases were measured by radioreceptor assay (RRA) and the values were compared in parallel with that by radioimmunoassay (RIA) . The results showed that the RRA values were lower than the RIA values, but both assays gave significant correlation between the serum drug level and antipsychotic dose.  
        关键词：radioreceptor assay;Radioimmunoassay;Antipsychotic drugs   
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        发布时间：2022-08-16
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