最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：In this paper, a new method for fission track dating standardization--Zeta constantcalibration, and the apatite fission track analysis and its application in thermal histories of sedimentary basins for hydrocarbon resource evaluation are described.
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发布时间：2021-04-20 - 摘要：The application of NTT in environment science is briefly described. Presence of Rn, U and Pb in environment is a ubiquitous hazard to human health. But radon can help to locate natural resources and radon measurements have the potential tor prediction of both earthquakes and volcanic eruptions. Therefore in recent years the NTT has been exlensive-ly applied in the environment research field.
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发布时间：2021-04-20 - 摘要：CR-39 plastic nuclear track detectors have been cast with no additive and with methyl methacrylate, diallyl phthalate, dibutyl phthalate and di-（2-ethylthexyl） phthalate. After irradiated with 5.15 MeV a particles, the responses of the detectors were found to be significantly different for each kind of additive. The performance was reported of a new CSR solid state nuclear track detector, the CR-39 （DPA）. The sheets with 1 % addition of DPA of CR-39 monomer were more sensitive than those of pure CR-39.
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发布时间：2021-04-20 - 摘要：A solid bubble-damage neutron detector has been developed based on freon liquid drop-lete suspended in polylamide. Tests show that the detector is sensitive to fast neutrons and a proportional relationship between bubble number and neutron fluerce is obtained within a certain range of neutron fluence. Therefore, it can be used as fast neutron detector and dosimeter. Our experiments also show that the sensitivity of the detector increases with temperature.
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发布时间：2021-04-20 - 摘要：Determined were the percentage of C=C double bond in CR-39, the molecular weight and the distribution of polyallyl chains obtained by hydrolysis of the plastic. C=C（%） is 0.83% and 0.66% before and after irradiation, respectively. Mn= l.87×103 and 1.79×103 while Ma,=7.39×103 and 12.2×103 before and after irradiation respectively. The hydrolysis of CR-39 after irradiation is by far faster than before irradiation. These experimental results indicate that irradiation can initiate C=C double bond in CR-39, the racia-tion crosslinking occurs mainly on polyallyl chains and the radiation degradation mainly on diethyleneglycol dicarborate links.
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发布时间：2021-04-20 - 摘要：The indoor and outdoor radon measurements in Haerbin and Yanan have been made with CSR detectors. At main measuring sites the balloon method has been used to measure the latent energy of daughters and the equilibrium factor. The results by the two methods have been compared and analysed. The measurements with CSR detectors indicate that the indoor radon concentration ranges from 16 to 144 Bq/m3 with an average of 73Bq/m3 in Haerbin, while from 13 to 78 Bq/m3 with an average of 35 Bq/m3 in Yanan. The results are compared with those with the balloon method, showing that the two methods are consistent within an error of 40%.
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发布时间：2021-04-20 - 摘要：The distribution of a particles at eight sites of three districts in Zhengzhou was measured by the CSR （a SSNTD）. It was shown that the CSR was suitable for environmental radon measurement because of its high sensitivity, good resolving power for electric charge, and the ability to record a particles accompanied by β and γ radiation.
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发布时间：2021-04-20 - 摘要：The general structure of the SSNTDs and spark counters and their application in radon monitoring are described. Some factors affecting the upper detectable limit of spark counters are discussed. Some results of our work in the first intercomparison of the passive radon detector in China are reported.
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发布时间：2021-04-20 - 摘要：A study on fission track ages of apatite for eight samples from Lunnan-1 Well in Talimu Basin shows that the apatite ages decrease with the depth of the hole, and down to 5500 meters the apparent age value changes to zero. The oil generation window occurs between 3100 and 6300m, and the oil generation period was from 40 to 80 Ma.
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发布时间：2021-04-20 - 摘要：The fission track analysis method was used for the age determination of tektite. The tektite samples studied were obtained from Hainan Island and Leizhcu Peninsula. The method consists in cutting and polishing two sections of a sample, irradiating one of these with a known thermal neutron flux（5.90×1015/cm2）, etching each section identically with hydrofluoric acid, and then comparing the fission track densities in two cases with a microscope. Their fission track age is found to be around 0.7Ma.
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发布时间：2021-04-20 - 摘要：Revealing spontaneous fission tracks in zircon by H2SO4, HNo3 and HCl mixed with an equivolume 40% HF respectively at 150℃ or 190℃ has been compared. Respective plateaus of track density in various etching conditions were found. The result indicates that the effect of HNO3 + HF system is better than others and it is better at 190℃ than at 150℃
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发布时间：2021-04-20 - 摘要：Length distributions of confined tracks in apatites collected from the cores at various depths of exploratory boreholes in the Lirqing Sedimentary Basin were determined and thermal histories were analysed on the basis of the distributions and fission, track ages. The relationship between track de"sity and track length for annealing of fossil fossion tracks in apatites was discussed as well.
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发布时间：2021-04-20 - 摘要：The revelation of heavy ion tracks in olivine after partial annealing has been studied by the TINT technique. Large variations of mean volume track lengths have been found for the given ion and annealing conditions. The phenomena m y be attributed to the dif ferent orientatinns of tracks with respect to the crystallographic system.
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发布时间：2021-04-20 - 摘要：The application of the fission track dating to the Jiuzhoutai loess profile in Lanzhou shows that the intergrowth gypsum on the bottom of the paofile was formed about 1.46 to 1.52 Ma ago, from which deducing that the age of loess accumulation at Jiuzhoutai was more than 1.5 Ma.
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发布时间：2021-04-20 - 摘要：Radiobiological investigations in two biostack experiments with plastic nuclear track detectors on board of Chinese retrievable satellite in August 1988 are presented. The preliminary results of mutation breeding are satisfactory.
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发布时间：2021-04-20 - 摘要：Trace U in beverages and mineral water has been estimated using the fission track an-alysis technique. The U contents in beverages vary from 0.26 ± 0.03 to 1.65±0.07 ppb, with an average of 0.93±0.05ppb. The mean U content in mineral water is 9.20±0.16 ppb, which is 10 times higher than that in other beverages.
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发布时间：2021-04-20 - 摘要：Statistical properties of quadratic and circular tracks are investigated by analytical calculations and Monte Carlo computer simulations. Analytical expressions for tne effective porosity and the probability of forming single, double and multiple holes are given e.s a function of the nominal porosity. A computer simulations is given. The above probability is determined by observing the number and diameter of holes under an optical microscope.
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发布时间：2021-04-20 - 摘要：A systematic study has been performed of the methods for determination of liquid viscosity with nuclear track membranes. Absolute and relative measurements have been suggested, the latter including relative measurements of absolute viscosity and kinematic viscosity. The study shows that the nuclear track membrance is a unique element for determination of liquid viscosity because it is small in volume, accurate in results and easy to manipulate in industries and laboratories.
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发布时间：2021-04-20 - 摘要：Suspended solids and sulphate reducing bacteria （SRB） were removed from the injection water of oil fields by using nuclear track microfilters. The grain-size distributions of suspended solids, the effectiveness of SRB elimination and the flow-rate characteristics have been measured. A comparison of the theoretical removal rates with the experimentali values is given.
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发布时间：2021-04-20 - 摘要：A measurement method of neutron fluence distribution for intensive beam generators based on the fission tracks was described. The distribution at different distances along the 0oooooooooo direction of the deuteron beam from the target was measured and the results were compared with the results of Al activation and the theoretical calculation. The r.eutron fluence distribution for different angles on the plane which was 11.3 cm from the target, was also measured. The neutron fluence distribution on the spherical surface was then calculated and. compared with the theoretical calculation. The two agree within the experimental error.
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发布时间：2021-04-20 - 摘要：The definition of the effective atomic number for an infinitively thin fission source is described. The principle and method of measuring the effective atomic number with SS NTD are presented. A checking experiment indicates that the method is feasible.
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发布时间：2021-04-20
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