最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：The measurement principle and the construction of the thickness gauge used for measuring the gold plating layer was described. The measured range for the gold layer thickness is less than 10µm and the precision of measurement is better than ±0.5µm.关键词：thickness gauge used for X-ray fluorescence;241Am source;procorpalation counter
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发布时间：2022-09-13 - 关键词：cycle activation;delayed neutron methods
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发布时间：2022-09-13 - 摘要：This paper introduced a plastic track detector. It was applied for measuring the cumulative expoure of radon and its daughters in mine and environment.According to the maximum energy loss of a particles in polycarbonate plastic the sensitive volume of detection can be increased. First the plastic foil is corroded and then we get magnified tree tracks with electrical chemical etching, the corresponding expoure was determined from the measured track densities.The detectors were calibrated in a laboratory radon chamber. The calibration factor has been measured to be 11 tracks/cm2-WLH, depending on equilibrium factor F. The low limit and upper limit of the detection are 0.5 WLH and 50 WLM, respectively.关键词：sensitive volume;chemical preetching;electrical chemical;etching;detective efficiency
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发布时间：2022-09-13 - 摘要：A radioisotope X-ray fluorescence borehole logger has been designed and fabricated.It can directly be applied to assaying the content of elements in ores and rocks and measuring the thickness of ores and linear reserve in borehole.关键词：radioisotope X-ray fluorescence borehole logger;tin antimony;barite;content;thickness;linear reserve
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发布时间：2022-09-13 - 摘要：In this paper the principle, structure and measuring systems of a neutron absorbed dose calorimeter are described. With this neutron calorimeter, the neutron dose on a swimming pool research reactor was measured and the result was satisfactory. This calorimeter has the advantage of simple structure and quick measurement. This design can also be used to other absorbing materials whose specific heat values have been carefully determined.关键词：neutron absorbed dose;Calorimeter;swimming pool
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发布时间：2022-09-13 - 摘要：N2ase is made up of two distinct and separately isolated proteins. An Fe protein and an Mo-Fe protein that has two Mo atoms per mole. 99Mo decays to excited nuclear state of 99Tc. The angular correlation of the 741—181keV γ rays were emitted subsequently in the deexcitation of the 99Tc through the medial state 5/2 +. 99Mo was incorporated in N2ase by incubation. After freezing the solution of 99Mo labelled N2ase the attenuation factor G2 of PAC and quadrapole frequency ωe were determind. Compared with the G2 and ωe of other 99Mo labelled complexes, the oxidation state and coordination structure of 99Mo in N2ase were speculated. The mechanism of nitrogen fixation by N2ase was also discussed according to the principle of electron transformation.关键词：perturbed angular correlations;nitrogenase;coordination structure;oxidation states
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发布时间：2022-09-13 - 摘要：The beam (proton) energies of our modified cyclotron have been measured by a time of flight method. The experimental errors are in the range of ±0.3%. The results are 11.68±0.03, 14.79±0.04, 19.95±0.06, 24.90±0.07 and 29.86±0.09MeV, respectively.关键词：time of flight technique;Cyclotron
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发布时间：2022-09-13 - 摘要：This paper describes the principle and method for determining the relative neutron sensitivity (KU) of the photon dosimeters. With a modified lead attenuation method, the KU values of a 2cm3 C-CO2 (FWT, IC-17G) and a 3cm3 Al-Ar (FWT, IC-17A1) chambers were determined as 0.271±0.021 and 0.132±0.006 respectively. KU of a Geiger-muller counter (FWT, GM-2 (446)) was determined as 0.0173±0.002. Comparing these results with other experimental data one can find that the relative neutron sensitivity (KU) of the photon dosimeters was not very sensitive to the µ/f of photon component. The uncertainty of KU measured in the lead filtration method was estimated. The neutron and gamma absorbed-doses for ICRV muscle tissues in same mixed field have been measured by technique of paired detectors.关键词：neutron dosimeters;pb weaken;biodetectors relative neutron sensitivity;absorbed dosimetry
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发布时间：2022-09-13 - 摘要：A beam optical transport program "OPTIC-II" (version 32) has been transplanted at PDP-11/34 computer. In order to solve some difficults encountered during the transplantation, we have to change the types of some arrays; to transform patterns of input and output data; to use virtual arrays and overlay technique.关键词：Beam optics;transport program;program transplante;Tandem accelerator
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发布时间：2022-09-13 - 摘要：This report describes the synthesis of radioiodinated 1-carboxamidino-4-phenylpipera-zine——a new adrenomedullary imaging radiopharmaceutical.To 4-phenylpiperazine in water a slight excess of s-methyl-thiouronium sulfide was added. The solution was heated at reflux for 6h and then cooled to room temperature, The precipitate formed was collected and recrystallized from hot water. This compound was radioiodinated by the chloramine-T method. The iodinated tracer was purified by paper chromatography. The yield was about 86% (from 83% to 89%). The radiochemical purity was over 98%.关键词：Radioiodine;Radiopharmaceutical;1-carboxamidino-4- phenylpipera-zine
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发布时间：2022-09-13 - 摘要：2,5 Di (p-tolyl) 1, 3, 4-oxadiazole (P-TTD) is a new primary scintillator. Its counting effecincy, quenching, resistance, chemical stability and improvement after the addition of the second scintillator POPOP were measured and it is proved to be ideal primary scintillator comparable to 2-phenyl-5- (4'-biphenylyl)-1, 3, 4-oxadiazole (PBD). Furthermore, it costs only one fifth of PBD.关键词：2, 5 Di (p-tolyl) 1, 3, 4 -oxadiazole (P-TTD) primary scintillator;counting effecincy;quenching;2-phenyl-5- (4'-biphenylyl)-1, 3, 4-oxadiazole (PBD)
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发布时间：2022-09-13 - 摘要：This paper derived statistic error formulas of calculating ejection fraction of multicrystal γ camera and comparied multicrystal γ camera to monocrystal γ camera in calculated precision. It is indicated that multicrystal γ camera provides the better precision in cardiac dynamic research.关键词：ejection fraction;variance;Background;Poison distribution
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发布时间：2022-09-13 - 摘要：The vertical distribution of Cd, form change and the relation between Cd concentration and pH on paddy soil have been investigated in Zhangshi wastewater-irrigated area. And the sources of Cd in brown rice have been pointed out.The authors examined the pathway of Cd accumulation in rice grains, and stated methods for reducing its Cd content.And finally, a mathematical model was established for calculating limiting values of Cd concentration in irrigated water on the basis of tracer experiments.关键词：brown rice;rice grain;form change
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发布时间：2022-09-13 - 摘要：After 3H-muscone enter the body through different routes, it can pass through blood-brain-barrier rapidly and is distributed very rapidly in the viscera. We have observed metallic silver grains from 3H-muscone in central nervous system with microscopy, it appeared diffusible distribution and it retained longer in the brain than in other tissues. But it deposits more in cerebella than in cerebral. 3H-muscone also appeared diffusible distribution in other tissues and organs besides brain. In 30 minuted, 3H-muscone deposited in such order as follows: lungs, liver, skin, kidneys, heart, spleen, muscle. As stated above, it suggests that musk is also excreted through respiratory tract, skin and sweat glands in addition to biliary system and urinary system.关键词：autoradiography muscone
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发布时间：2022-09-13 - 摘要：The specificity of acupuncture points and the central nervous pathways of transmitting messages induced by electroacupuncture were studied by 3H-deoxyglucose autoradiography with rats. Traction and pulling reaction of the stomach was used as index.The results showed that: 1. The most evident inhibitory effect on traction and pulling reaction of the stomach was produced by "Foot-sanli" point and the effects of "Renzhong" and "Chengjiang" points were inferior to it. "Neiguan" point produce no inhibitory effect. 2. The messages of acupuncture were transmitted via the somatic sensory pathways.关键词：3H-deoxyglucose;Autoradiography;Acupuncture;specificity of acupuncture points
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发布时间：2022-09-13 - 关键词：radioisotope relay;design philosophy
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发布时间：2022-09-13 - 关键词：sequential fission;multifragment
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发布时间：2022-09-13
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