以PVB为基材的低剂量辐射变色薄膜剂量计研究

Research on Low-Dose Radiochromic Film Dosimeters Based Polyvinyl Butyral

摘要: 研制了一种具有低剂量响应特征的辐射变色薄膜，剂量范围从几十至若干个千戈瑞。选用隐色孔雀绿（LMG）为染料，以聚乙烯缩丁醛（polyvinyl butyral, PVB）为基材制备辐射变色薄膜剂量计，该剂量计经几百Gy剂量辐照后颜色从无色变成深绿色，利用钴源对该种辐射变色薄膜剂量计的剂量学性能进行了研究，结果表明，该剂量计具有较好的剂量响应线性特性和较大的剂量响应范围（20~6 500 Gy），可用于血液辐照、食品辐照和环境辐射监测等更多领域。

Abstract: To prepare a radiochromic films which are sensitive even under a low dose of irradiation from tens to several kGy, and also to observe the characteristics of the dosimeters for better application development. The formula of a low-dose radiochromic film dosimeters containing leuco-malachite green(LMG) dye in polyvinyl butyral(PVB) were studied. This film dosimeter changes color from colorless to deep green under irradiation at doses above several hundreds of Gy. The dosimetric properties of the PVB-LMG film dosimeter were studied. The results of dosimetric testing show that the dose-response curves have very good linearity in the range 20-6 500 Gy for ⁶⁰Co γ-rays. This kind of radiochromic film is suitable as dosimeters for dose measurements, e.g. in the blood irradiation, food irradiation and environmental protection.