PVT辐射致色剂量计

PVT RADIOCHROMIC FILM DOSIMETER

本工作研制了一种新型的辐射致色薄膜—PVT膜。可用于测量辐射加工现场的吸收剂量。PVT膜(含染料的聚乙烯醇薄膜)检测下限低(0.2kGy),对^(60)CoΥ射线在0.2—50kGy间有良好的线性响应(相关系数Υ达0.999以上),测量精密度(σ)为±4%,响应灵敏度高,且与辐照角度无关;剂量率在4—143Gy/min,剂量响应与剂量率无关;相对湿度在12.5—54.6%,湿度变化对剂量响应无影响。此外,PVT膜对环境温度适应性良好,对光不敏感,相对湿度在0—75.5%条件下保(?)个月,本底吸光度(A_0)值基本无变化。

A new radiochromic film dosimeter is prepared. It can be utilized to measure absorbed doses in radiation processing. The radiochromic film has been found to have advantages in reproducibility, stability, dose rate between 4 and 143Gy/min and independence on irradiation angle and negligible variation for most environment parameters. In addition, the film has sensitive response, lower limit of measurement (0.2kGy) and good linear response in the region of 0.2—50kGy to ^(60)Co gamma rays. The linear correlation coefficient is more than 0.999 and the measuring precision (σ) ±4%.