最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 10, (1999)
        摘要：In the pre-dose technique, the change in 110℃ TL sensitivity with dose is generally represented by a linear function. But it was found that the growth of sensitivity with dose was sublinear even if dose was less than a few Gy on porcelain and pottery. According to the saturating exponential characteristic of archaeological samples, a new method for evaluating paleodose was studied. In addition, a correction for the radiation quenching was made.  
        关键词：Porcelain;TL dating;Pre-dose;Saturating exponential   
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        发布时间：2021-03-12
      • LI Huhou
        Issue 10, (1999)
        摘要：The phenomena of luminescence were discussed on the basic of reaction of radiation with matter. Impurities in crystal have essential effects upon crystal luminescence- Two mechanisms are found in crystal luminescence. One is the irradiation induced luminescence which will vary with the irradiation doses the crystal received. The other is non-irradiation related, such luminescence is depend on impurities in crystal. The superlinearity correction part of equivalent dose method in TL dating belongs to the non-irradiation type, so such correction is unnecessary.  
        关键词：Thermoluminescence;Crystal impurity;Equivalent dose   
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        发布时间：2021-03-12
      • JIN Sishao
        Issue 10, (1999)
        摘要：The Al-center ESR dating was briefly introduced. The Al- center ESR full-peak spectra were obtained at 98K for three samples of gneiss from different depths, and their ages were deduced to be 1.14Ma, 1.10Ma and 0.50Ma respectively. The results were in accordance with the geologic background, thus proving that this technique is feasible for dating of hypabyssal metamorphic rock.  
        关键词：ESR;Al-centre;Gneissic granite   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：The following problems regarding the ESR dating of fossil enamel samples from palaeo-anthropological and palaeolithic sites of Early Pleistocene are discussed:1) the applicability of exponential fitting in the additive method for reliable AD determination, 2) the thermo-stability of the g= 2.0018 line of hydroxyapatite and its influence on apparent ESR ages; 3) the right selection of U-uptake models, and 4) the effect of high U-content in enamel on the ESR ages. It is concluded that the ESR-EU ages of Early Pleistocene enamel samples can only be regarded as the lower limit of the true ages if no appropriate corrections for the factors discussed above are made.  
        关键词：ESR dating;Fossil enamel;Early Pleistocene   
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        发布时间：2021-03-12
      • LIANG Renyou
        Issue 10, (1999)
        摘要：Ten stalagmite samples from Guangxi and Fujian of south China have been studied and their paramagnetic defects and the complex ESR signals have been researched. For each ESR signal, the response to radiation dose was different. The responses of two signals (g=2.0007 and g=2.0023) were found more sensitive. The mean life of signal g=2.0023 was only 4.8 years at 20℃, but that of the signal g=2.0007 was about 105 years, therefore the signal g=2.0007 can be chosen for ESR dating. The effect of sa-mple’s grinding on the dating was also discussed.  
        关键词：Stalagmite;ESR characterization;Paramagnetic centre;γ radiation dose   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：There is only one main dosimetric peak on the thermoluminescence glow curve of MgSO4:Dy,Mn phosphor prepared by co-dopant. The peak parameter and trap parameter of the dosimetric peak were determined by deconvolution of their glow curves with general order kinetics for MgSO4:Dy,Mn sarnples irradiated with 60Co γ rays at different dose levels. The mean peak temperature of the dosimetric peak was found at 383.1℃, as the mean activation energy E~ 1.972eV and the mean frequency-factor ~ 4.294 ×1014s-1 with kinetics order b≈2. The TL dose-response to 60 Coγ rays in the dose range of 0.1Gy- 20kGy was obtained and fitted by the composite action dose response function to give the nonlinear characteristic parameters which showed this response to be supralinear. The dose response to the 226Ra γ rays in the range of 0.1mGy- 0.1Gy was also measured and found to be linear. Therefore, it is possible that the MgSO4:Dy,Mn will be used to measure the annual dose in TL and ESR dating and the radiation dose at higher temperature or in higher-dose circumstances due to its high thermal stability and wide dose response range.  
        关键词：Thermoluminescence;Trap parameter;Thermal stability;Dose response   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：It is important to remove the thermally unstable charges before luminescence measurement to avoid age underestimation in luminescence dating. The routine method is preheating. In this paper, the relationship between ED and preheating time and temperature, and the relationship between (N+β )/N ratio and preheating temperature were studied for the IRSL dating of Chinese lpess. It is concluded that 5 or 10min at 200-250℃, or 6h at 160℃ is a suitable preheating condition for the IRSL dating of Chinese loess.  
        关键词：Loess;IRSL dating;Preheating condition;ED plateau   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：The dating of terrace deposits, especially the terrace surface, is usually a chronological foundation, on which series of regional climate and tectonic events can be established. In this paper, the deposit ages of lower terrace sediments along the major rivers were determined by TL dating along Xiaojiang fault zone. Comparing with the deposit age of the same level terrace sediment in the vicinity, the formed ages of the lower terraces surface were estimated, thus providing a chronological evidence for establishing the series of the recent clanate and tectonic events in the region concerned.  
        关键词：Thermoluminescence dating;Terrace deposits;Terrace surface   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：In order to improve accuracy of TL authentication test for porcelain, a method of direct measurement of annual β dose using ultrathin TLD (CaSO4.Tm) on porcelain was studied. Since the TLD was placed into a hole left after sampling for the TL measurement, the method will not cause any new damage to the studied object. The results show that the technique is suitable for measuring annual β dose and improving accuracy of TL authentication test for both porcelain and pottery.  
        关键词：Porcelain;Annual β dose;TLD   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：The occasional presence of thermoluminescent clay/sand core remains in bronze raises a possibility of dating them with the TL technique. In the dating of several bronze objects excavated in Shanxi Province, some satisfactory results have been achieved with dating accuracy between 8% and 12%. Since the sample collection does no harm to the bronze body, the TL dating technique can be more widely applied in the dating and authenticity tests.  
        关键词：Bronze ware;Clay core;Sand core;TL;dating   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：When a quartz sandstone target was shocked by a steel ball(6mm in diameter) accelerated to 7km/s by using a two-stage light gas gun, the crystal structure and physical characteristics of the quartz was changed. By measuring the TL of the quartz sandstone before and after shocking it was found that the TL of the quartz sandstone decreased with the increasing shocking pressure and there was a TL gradient from outside to inside around the shocked point. The induced TL test was made for the sample taken from the shocked point at the same time, and an induced TL gradient from outside to inside was also found, though it was less than natural TL gradient. A sample with TL gradient is often valuable for meteror crater determination.  
        关键词：Shock;Quartz;TL gradient;Age determination   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：Some problems were found in the alpha source calibration. Two of such problems are discussed in this paper: 1) distribution of the alpha radiation dose on an area of lonun diameter was seriously non-uniform, the non-uniformity was due to poor quality of the 244Cm source used; 2) the offset dose could not be ignored for some irradiators. The offset doses for twokinds of beta irradiators have been determined,and the calculation equation for the dose was derived.  
        关键词：TL dating;Alpha source calibration;Non-uniform field;Offset dose   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：The Kueishantao’s TL age of 7000± 800 years was obtained by using the fine-grain technique.  
        关键词：TL age;Kueishantao   
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        发布时间：2021-03-12
      • Issue 10, Article number: 635(1999)
        摘要：In this paper the TL dating results for the sedhoents in the Taibei Basin are reported.  
        关键词：TL age;Sediments;Taibei Basin   
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        发布时间：2021-03-12
      • Issue 10, (1999)
        摘要：LiF(Mg,Ti) thermoluminescence dosimeter (TLD) was applied to measure dose response to irradiation of 49.3MeV/u 12C ion beam supplied by HIRFL. Moderate variance of dose-response efficiency was found when particle fluence increases from 1×107 to 2×10 8/cm2 . The average dose-response efficiency 57% was obtained. This phenomenon implies that LiF can be used to measure absorbed dose in a certain range of particle fluence . Moreover, the result is in a good agreement with the calculated dose-response efficiency 54% to 50MeV/u 12C ion beam, which was predicted by the model of heavy-ion track structure at GSI, Germany.  
        关键词：Thermoluminescence dosimeter;Dose-response efficiency;Dose response;Heavy ion beam   
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        发布时间：2021-03-12
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