Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities

QIU Rui; ZHANG Hui; YANG Bo; James C; Sayed H; Michael B; LI Jun-Li

doi:10.1088/1674-1137/38/12/129001

Chinese Physics C> 2014, Vol. 38> Issue(12) : 129001 DOI: 10.1088/1674-1137/38/12/129001

Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities

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Abstract：
An ionizing radiation hazard produced from the interaction between high intensity lasers and solid targets has been observed. Laser-plasma interactions create "hot" electrons, which generate bremsstrahlung X-rays when they interact with ions in the target. However, up to now only limited studies have been conducted on this laser-induced radiological protection issue. In this paper, the physical process and characteristics of the interaction between high intensity lasers and solid targets are analyzed. The parameters of the radiation sources are discussed, including the energy conversion efficiency from laser to hot electrons, hot electron energy spectrum and electron temperature, and the bremsstrahlung X-ray energy spectrum produced by hot electrons. Based on this information, the X-ray dose generated with high-Z targets for laser intensities between 10¹⁴ and 10²⁰ W/cm² is estimated. The shielding effects of common shielding items such as the glass view port, aluminum chamber wall and concrete wall are also studied using the FLUKA Monte Carlo code. This study provides a reference for the dose estimation and the shielding design of high intensity laser facilities.

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QIU Rui, ZHANG Hui, YANG Bo, James C, Sayed H, Michael B and LI Jun-Li. Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities[J]. Chinese Physics C, 2014, 38(12): 129001. doi: 10.1088/1674-1137/38/12/129001

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Received: 2013-12-09
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities

Corresponding author: LI Jun-Li,

Received Date: 2013-12-09

Accepted Date: 2014-07-07

Available Online: 2014-12-05

Abstract: An ionizing radiation hazard produced from the interaction between high intensity lasers and solid targets has been observed. Laser-plasma interactions create "hot" electrons, which generate bremsstrahlung X-rays when they interact with ions in the target. However, up to now only limited studies have been conducted on this laser-induced radiological protection issue. In this paper, the physical process and characteristics of the interaction between high intensity lasers and solid targets are analyzed. The parameters of the radiation sources are discussed, including the energy conversion efficiency from laser to hot electrons, hot electron energy spectrum and electron temperature, and the bremsstrahlung X-ray energy spectrum produced by hot electrons. Based on this information, the X-ray dose generated with high-Z targets for laser intensities between 10¹⁴ and 10²⁰ W/cm² is estimated. The shielding effects of common shielding items such as the glass view port, aluminum chamber wall and concrete wall are also studied using the FLUKA Monte Carlo code. This study provides a reference for the dose estimation and the shielding design of high intensity laser facilities.

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Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities

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