# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (3): 35

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Measurement of air kerma rate and ambient dose equivalent rate using the G(E) function with hemispherical CdZnTe detector

Ping Huang 1,2

1. 1 National Institute of Measurement and Testing Technology, Chengdu 610021, China
2 Sichuan Radiation Technology Co., Ltd, Chengdu 610021, China
• Contact: Ping Huang E-mail:zhangyaohp@163.com
• Supported by:

This work was supported by the National Key Scientific Instruments to Develop Dedicated (Nos. 2013YQ090811 and 2016YFF0103800).

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Ping Huang. Measurement of air kerma rate and ambient dose equivalent rate using the G(E) function with hemispherical CdZnTe detector.Nuclear Science and Techniques, 2018, 29(3): 35

Abstract:

Since the room-temperature detector CdZnTe (CZT) has advantages in terms of detection efficiency, energy resolution, and size, it has been extensively used to detect X-rays and gamma-rays. So far, nuclear radiation detectors such as cerium chloride doped with lanthanum bromide (LaBr $_3$ (Ce)), thallium doped with cesium iodide (CsI (Tl)), thallium doped with sodium iodide (NaI (Tl)), and high-purity germanium (HPGe) primarily use the spectroscopy-dose rate function (G(E)) to achieve the accurate measurement of air kerma rate ( $\dot{K}_{a}$ ) and ambient dose equivalent rate ( $\dot{H}^*(10)$ ). However, the spectroscopy-dose rate function has been rarely measured for a CZT detector. In this study, we performed spectrum measurement using a hemispherical CZT detector in a radiation protection standards laboratory. The spectroscopy-dose rate function G(E) of the CZT detector was calculated using the least-squares method combined with the standard dose rate at the measurement position. The results showed that the hemispherical CZT detector could complete the measurement of air kerma rate ( $\dot{K}_{a}$ ) and ambient dose equivalent rate ( $\dot{H}^*$ (10)) by using the G(E) function at energies between 48 keV and 1.25 MeV, and the relative intrinsic errors were, respectively, controlled within ± 2. 3 and ± 2. 1%.