Absolute measurement of photon flux for synchrotron radiation hard X-rays

Hua-peng LI; Wei-ning ZHENG; Yi-dong ZHAO; Pei-wei WANG; Fan LI

doi:10.3788/OPE.20172511.2845

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Absolute measurement of photon flux for synchrotron radiation hard X-rays

X-ray Optics | 更新时间：2020-07-07

- Absolute measurement of photon flux for synchrotron radiation hard X-rays
- Optics and Precision Engineering Vol. 25, Issue 11, Pages: 2845-2851(2017)
- 作者机构：
  
  1.中国科学院高能物理研究所, 北京 100049
  2.北京北一机床股份有限公司, 北京 101300
  3.中国计量科学研究院, 北京 100029
  4.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172511.2845
  CLC： O434.12
- Received：20 March 2017，
  
  Accepted：15 April 2017，
  
  Published：25 November 2017
- 稿件说明：
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Hua-peng LI, Wei-ning ZHENG, Yi-dong ZHAO, et al. Absolute measurement of photon flux for synchrotron radiation hard X-rays[J]. Optics and precision engineering, 2017, 25(11): 2845-2851.
DOI：

Hua-peng LI, Wei-ning ZHENG, Yi-dong ZHAO, et al. Absolute measurement of photon flux for synchrotron radiation hard X-rays[J]. Optics and precision engineering, 2017, 25(11): 2845-2851. DOI： 10.3788/OPE.20172511.2845.

摘要

在北京同步辐射光源上使用自由空气电离室绝对测量了同步辐射硬X射线光子通量。通过自由空气电离室复现空气比释动能率量值，根据在电离辐射量及其单位中定义的空气比释动能与注量及通量的关系，定量得到了光子通量。由于在测量期间，光子通量随时间变化，而测量需要一定的时间，因此，研究了配套的在线通量监测系统，监测带来的不确定度为0.03%。通过测量空气衰减修正因子及复合损失修正因子，结合在线通量监测，在能量为15 keV的同步辐射X射线上用自由空气电离室复现了空气比释动能率。在实际实验条件下复现的空气比释动能率为0.239 Gy/s，从而得到同步辐射X射线的光子通量为5.28×10

photons/s，相对标准不确定度为0.68%。

Abstract

The photon flux of the synchrotron radiation hard X-rays was measured in Beijing Synchrotron Radiation Facility (BSRF) using a free-air ionization chamber. Absolute air-kerma can be obtained with the free-air ionization chamber. The photon flux was calculated based on the relation between air-kerma and flux in the fundamental quantities and units for ionizing radiation. Because the photon flux changes over time during the measurement

an online monitoring system was applied

and the uncertainty of which is 0.03%. The air attenuation correction factor and ion recombination correction factor were measured at 15 keV synchrotron radiation X-rays. The measurement results show that the absolute air-kerma rate at 15 keV synchrotron radiation X-rays is 0.239 Gy/s

accordingly

the photon flux of the source is 5.28×10

photons/s

the relative uncertainty is 0.68%.

关键词

Keywords

references

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