A feasibility study using radiochromic films for fast neutron 2D passive dosimetry.
A feasibility study using radiochromic films for fast neutron 2D passive dosimetry.
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DOI：
10.1088/0031-9155/55/17/007
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发表时间：
2010-09-07
影响因子：
3.5
通讯作者：
Dewhirst MW
中科院分区：
文献类型：
--
作者：
Brady SL;Gunasingha R;Yoshizumi TT;Howell CR;Crowell AS;Fallin B;Tonchev AP;Dewhirst MW
本文的目的有三个：(1)建立XRQA和EBT放射线变色膜对快中子曝光的敏感性；(2)建立薄膜对辐射剂量校准曲线的响应；(3)研究二维（2D）薄膜剂量测定技术，用于建立小鼠放射生物学照射的实验装置，并评估该装置中小鼠的剂量。薄膜通过2H(d,n)3He反应暴露在10mev中子束下。当辐照剂量为165 cGy时，XRQA膜对10 MeV中子束的响应比EBT膜的响应高1.39倍。在0 ~ 10 Gy范围内建立了膜响应-软组织剂量校准函数，与校准数据的拟合优度为0.9926。二维胶片剂量测定技术通过使用小鼠幻影测量剂量并在实验小鼠装置的外部放置一块胶片来估计小鼠的中子剂量。使用蒙特卡罗和铝箔活化测量对薄膜结果进行了基准测试。放射致色膜、蒙特卡罗和铝箔的剂量测量结果具有很强的相关性，小鼠幻影内的薄膜与外部安装的薄膜的一致性优于7%。这些结果证明了放射性致色膜在被动二维中子剂量测定中的潜在应用。
The objective of this paper is threefold: (1) to establish sensitivity of XRQA and EBT radiochromic films to fast neutron exposure; (2) to develop a film response to radiation dose calibration curve and (3) to investigate a two-dimensional (2D) film dosimetry technique for use in establishing an experimental setup for a radiobiological irradiation of mice and to assess the dose to the mice in this setup. The films were exposed to a 10 MeV neutron beam via the 2H(d,n)3He reaction. The XRQA film response was a factor of 1.39 greater than EBT film response to the 10 MeV neutron beam when exposed to a neutron dose of 165 cGy. A film response-to-soft tissue dose calibration function was established over a range of 0–10 Gy and had a goodness of fit of 0.9926 with the calibration data. The 2D film dosimetry technique estimated the neutron dose to the mice by measuring the dose using a mouse phantom and by placing a piece of film on the exterior of the experimental mouse setup. The film results were benchmarked using Monte Carlo and aluminum (Al) foil activation measurements. The radiochromic film, Monte Carlo and Al foil dose measurements were strongly correlated, and the film within the mouse phantom agreed to better than 7% of the externally mounted films. These results demonstrated the potential application of radiochromic films for passive 2D neutron dosimetry.
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