Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator
The bremsstrahlung is an important source term in the shielding design of the electron accelerator. In order to study the characteristics of the photon source term in the 90° direction and the influence of target radius and thickness on the bremsstrahlung in the 90° direction, the Monte Carlo progra...
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| Format: | Article |
| Language: | English |
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Editorial Board of Atomic Energy Science and Technology
2022-10-01
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| Series: | Yuanzineng kexue jishu |
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| Online Access: | https://www.aest.org.cn/CN/abstract/abstract21577.shtml |
| _version_ | 1811309414666207232 |
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| author | ZHAO Feng;YANG Litao;YIN Yuhao;JIANG Jun;REN Zicheng;WANG Ying |
| author_facet | ZHAO Feng;YANG Litao;YIN Yuhao;JIANG Jun;REN Zicheng;WANG Ying |
| author_sort | ZHAO Feng;YANG Litao;YIN Yuhao;JIANG Jun;REN Zicheng;WANG Ying |
| collection | DOAJ |
| description | The bremsstrahlung is an important source term in the shielding design of the electron accelerator. In order to study the characteristics of the photon source term in the 90° direction and the influence of target radius and thickness on the bremsstrahlung in the 90° direction, the Monte Carlo program of MCNPX27 was used to calculate the radiation source term from the 15 MeV3 GeV electron beam incident on the iron target with different thicknesses and radii. The variation characteristics of radiation source items such as photon radiation dose rate and photon energy spectrum with target thickness and radius were obtained and comparatively analyzed. By comparing with the photon source term in the 0° direction and the energy deposition of cascade electron in the target, the main features of the photon source term in the 90° direction were obtained. Finally, the effects of beam power and beam intensity on radiation dose rates in the 90° and 0° directions were analyzed. The result shows that, due to the combined influence of electron energy deposition in the target and self-absorption of photons from the target, the radius and thickness of the target are expected as important factors which affect the photon source term in the 90° direction. The energy of the cascade electrons deposited in the target and the radiation dose rate in the 90° direction increases with the thickness. As the energy of the cascade electrons is completely deposited in the target, the radiation dose rate in the 90° direction will not change with the target thickness. The radiation dose rate in the 90° direction also increases with the target radius, but when the target radius is larger, the radiation dose rate in the 90° direction decreases due to the selfabsorption. Apart from that, the effect of incident electron energy on the photon source terms in the 90° direction and 0° direction is different. More than 99% of the photons in the 90° direction are below 10 MeV, and most of them are within 3 MeV. In the 90° direction, the photon energy spectrum shape has little relationship with the incident electron energy. However, the photon energy in the 0° direction can reach the incident electron energy, which is generally much larger than the photon energy in the 90° direction, and the shape of the energy spectrum is greatly affected by the incident electron. As a suggestion, the influence of the target size should be considered in the shielding design of the electron accelerator, and the design in the lateral shielding should be optimized according to the difference between the photon source term in the 90° direction and 0° direction. |
| first_indexed | 2024-04-13T09:41:42Z |
| format | Article |
| id | doaj.art-25e90be03d6a4ef4ac0189bc9d8a0a98 |
| institution | Directory Open Access Journal |
| issn | 1000-6931 |
| language | English |
| last_indexed | 2024-04-13T09:41:42Z |
| publishDate | 2022-10-01 |
| publisher | Editorial Board of Atomic Energy Science and Technology |
| record_format | Article |
| series | Yuanzineng kexue jishu |
| spelling | doaj.art-25e90be03d6a4ef4ac0189bc9d8a0a982022-12-22T02:51:53ZengEditorial Board of Atomic Energy Science and TechnologyYuanzineng kexue jishu1000-69312022-10-01561021392145Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron AcceleratorZHAO Feng;YANG Litao;YIN Yuhao;JIANG Jun;REN Zicheng;WANG Ying 0Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou 215004, ChinaThe bremsstrahlung is an important source term in the shielding design of the electron accelerator. In order to study the characteristics of the photon source term in the 90° direction and the influence of target radius and thickness on the bremsstrahlung in the 90° direction, the Monte Carlo program of MCNPX27 was used to calculate the radiation source term from the 15 MeV3 GeV electron beam incident on the iron target with different thicknesses and radii. The variation characteristics of radiation source items such as photon radiation dose rate and photon energy spectrum with target thickness and radius were obtained and comparatively analyzed. By comparing with the photon source term in the 0° direction and the energy deposition of cascade electron in the target, the main features of the photon source term in the 90° direction were obtained. Finally, the effects of beam power and beam intensity on radiation dose rates in the 90° and 0° directions were analyzed. The result shows that, due to the combined influence of electron energy deposition in the target and self-absorption of photons from the target, the radius and thickness of the target are expected as important factors which affect the photon source term in the 90° direction. The energy of the cascade electrons deposited in the target and the radiation dose rate in the 90° direction increases with the thickness. As the energy of the cascade electrons is completely deposited in the target, the radiation dose rate in the 90° direction will not change with the target thickness. The radiation dose rate in the 90° direction also increases with the target radius, but when the target radius is larger, the radiation dose rate in the 90° direction decreases due to the selfabsorption. Apart from that, the effect of incident electron energy on the photon source terms in the 90° direction and 0° direction is different. More than 99% of the photons in the 90° direction are below 10 MeV, and most of them are within 3 MeV. In the 90° direction, the photon energy spectrum shape has little relationship with the incident electron energy. However, the photon energy in the 0° direction can reach the incident electron energy, which is generally much larger than the photon energy in the 90° direction, and the shape of the energy spectrum is greatly affected by the incident electron. As a suggestion, the influence of the target size should be considered in the shielding design of the electron accelerator, and the design in the lateral shielding should be optimized according to the difference between the photon source term in the 90° direction and 0° direction.https://www.aest.org.cn/CN/abstract/abstract21577.shtmlelectron acceleratorshielding designbremsstrahlungtarget sizephoton source term |
| spellingShingle | ZHAO Feng;YANG Litao;YIN Yuhao;JIANG Jun;REN Zicheng;WANG Ying Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator Yuanzineng kexue jishu electron accelerator shielding design bremsstrahlung target size photon source term |
| title | Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator |
| title_full | Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator |
| title_fullStr | Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator |
| title_full_unstemmed | Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator |
| title_short | Research on Photon Source Term in 90° of 15 MeV-3 GeV Electron Accelerator |
| title_sort | research on photon source term in 90° of 15 mev 3 gev electron accelerator |
| topic | electron accelerator shielding design bremsstrahlung target size photon source term |
| url | https://www.aest.org.cn/CN/abstract/abstract21577.shtml |
| work_keys_str_mv | AT zhaofengyanglitaoyinyuhaojiangjunrenzichengwangying researchonphotonsourcetermin90of15mev3gevelectronaccelerator |