Energy response improvement for photon dosimetry using pulse analysis

Zaki Dizaji

doi:10.1088/1674-1137/40/2/026203

Chinese Physics C> 2016, Vol. 40> Issue(2) : 026203 DOI: 10.1088/1674-1137/40/2/026203

Energy response improvement for photon dosimetry using pulse analysis

Zaki Dizaji ^,

1.
Faculty of Science, Imam Hossein Comprehensive University, Tehran, Iran

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Abstract：
During the last few years, active personal dosimeters have been developed and have replaced passive personal dosimeters in some external monitoring systems, frequently using silicon diode detectors. Incident photons interact with the constituents of the diode detector and produce electrons. These photon-induced electrons deposit energy in the detector's sensitive region and contribute to the response of diode detectors. To achieve an appropriate photon dosimetry response, the detectors are usually covered by a metallic layer with an optimum thickness. The metallic cover acts as an energy compensating shield. In this paper, a software process is performed for energy compensation. Selective data sampling based on pulse height is used to determine the photon dose equivalent. This method is applied to improve the energy response in photon dosimetry. The detector design is optimized for the response function and determination of the photon dose equivalent. Photon personal dose equivalent is determined in the energy range of 0.3-6 MeV. The error values of the calculated data for this wide energy range and measured data for ¹³³Ba, ¹³⁷Cs, ⁶⁰Co and ²⁴¹Am-Be sources respectively are up to 20% and 15%. Fairly good agreement is seen between simulation and dose values obtained from our process and specifications from several photon sources.
- personal dose equivalent ,
- photon dosimetry ,
- diode detector ,
- energy compensation

References

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Zaki Dizaji. Energy response improvement for photon dosimetry using pulse analysis[J]. Chinese Physics C, 2016, 40(2): 026203. doi: 10.1088/1674-1137/40/2/026203

Zaki Dizaji. Energy response improvement for photon dosimetry using pulse analysis[J]. Chinese Physics C, 2016, 40(2): 026203. doi: 10.1088/1674-1137/40/2/026203 shu

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Received: 2015-03-17
Revised: 2015-05-28

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Energy response improvement for photon dosimetry using pulse analysis

Corresponding author: Zaki Dizaji,

1. Faculty of Science, Imam Hossein Comprehensive University, Tehran, Iran

Received Date: 2015-03-17

Accepted Date: 2015-05-28

Available Online: 2016-02-20

Abstract: During the last few years, active personal dosimeters have been developed and have replaced passive personal dosimeters in some external monitoring systems, frequently using silicon diode detectors. Incident photons interact with the constituents of the diode detector and produce electrons. These photon-induced electrons deposit energy in the detector's sensitive region and contribute to the response of diode detectors. To achieve an appropriate photon dosimetry response, the detectors are usually covered by a metallic layer with an optimum thickness. The metallic cover acts as an energy compensating shield. In this paper, a software process is performed for energy compensation. Selective data sampling based on pulse height is used to determine the photon dose equivalent. This method is applied to improve the energy response in photon dosimetry. The detector design is optimized for the response function and determination of the photon dose equivalent. Photon personal dose equivalent is determined in the energy range of 0.3-6 MeV. The error values of the calculated data for this wide energy range and measured data for ¹³³Ba, ¹³⁷Cs, ⁶⁰Co and ²⁴¹Am-Be sources respectively are up to 20% and 15%. Fairly good agreement is seen between simulation and dose values obtained from our process and specifications from several photon sources.

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Energy response improvement for photon dosimetry using pulse analysis

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