高通量试验堆(HFETR)辐照<sup>40</sup>Ar-<sup>39</sup>Ar定年样品条件初探

李军杰; 刘汉彬; 张佳; 金贵善; 张建锋; 韩娟; 石晓

doi:10.3799/dqkx.2019.006

Volume 44 Issue 3

Mar. 2019

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Article Navigation > Earth Science > 2019 > 44(3): 727-737

Li Junjie, Liu Hanbin, Zhang Jia, Jin Guishan, Zhang Jianfeng, Han Juan, Shi Xiao, 2019. Primary Research of High Flux Engineering Test Reactor(HFETR) for Irradiation of 40Ar-39Ar Dating Samples. Earth Science, 44(3): 727-737. doi: 10.3799/dqkx.2019.006

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Li Junjie, Liu Hanbin, Zhang Jia, Jin Guishan, Zhang Jianfeng, Han Juan, Shi Xiao, 2019. Primary Research of High Flux Engineering Test Reactor(HFETR) for Irradiation of ⁴⁰Ar-³⁹Ar Dating Samples. Earth Science, 44(3): 727-737. doi: 10.3799/dqkx.2019.006

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Primary Research of High Flux Engineering Test Reactor(HFETR) for Irradiation of ⁴⁰Ar-³⁹Ar Dating Samples

doi: 10.3799/dqkx.2019.006

Beijing Research Institute of Uranium Geology, Beijing 100029, China

Received Date: 2019-01-16
Publish Date: 2019-03-15

Abstract

Abstract

The domestic reactors which could be utilized for the irradiation of ⁴⁰Ar-³⁹Ar dating samples are not only rare but the operation frequency is very low, which makes the period of the irradiation for samples extremely long.Besides, the optimized parameters of irradiation for different kinds of samples are short of systematic research.To solve the above-mentioned problems, primary research was done on the HFETR in the application of the irradiation of ⁴⁰Ar-³⁹Ar dating samples for the first time.Through the irradiation of certain amount of biotite standard ZBH-25, the production efficiency of ³⁹Ar_K is determined, which could provide the basis for the irradiation time for samples with different ages or potassium contents.The axial neutron flux gradient of the irradiation channel, which shows approximative conic function (R²>0.99), is only 3.3%/cm.However, the radial flux gradient is much more obvious, which is as high as 7.1%/cm.The interference factors are determined through the irradiation of pure potassium salt and calcium salt.It is found that the (³⁶Ar/³⁷Ar)_Ca factor is uniform with the value (3.52±0.11)×10^-4, but the interference factors (⁴⁰Ar/³⁹Ar)_K and (³⁶Ar/³⁷Ar)_Ca are scattered at different positions of the irradiation channel.The shielding effect of cadmium for the decrease of the interference factor of (⁴⁰Ar/³⁹Ar)_K is prominent at the bottom of the sample vessel but negligible at the top of the sample vessel, which may result from the difference of the neutron spectrum along the axial direction of the irradiation channel.Taking the international standard sanidine FCs as neutron flux monitor, the domestic standards biotite ZBH-25 and hornblende BSP-1 are dated.Excellent plateau age is obtained for the ZBH-25 biotite standard, indicating that the HFETR could satisfy the requirement of the sample irradiation.However, the precision and accuracy of the plateau age of the BSP-1 hornblende is somewhat worse, which maybe has something to do with the relatively old age and low ratio of the K/Ca.Precise determination of the interference factors and proloning of the irradiation time are necessary for the improvement of the age quality for such kind of sample.
- HFETR,
- ⁴⁰Ar-³⁹Ar dating,
- sample irradiation,
- neutron flux gradient,
- interference factor,
- geochronology

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References(28)

References

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