Dosimetric evaluation of a chilled X-Ray irradiator

A new chilled X-ray system for insect irradiation was evaluated dosimetrically. The system was capable of irradiating up to 40 million sterile male mosquitoes per week with a DUR of 1.3 or better. Dosimetry was by GafchromicTM EBT-XD film, scanned at 75 dpi 24 hours after exposure and the color channel information extracted to Excel for processing. Files consist of tiff scans and Excel files of extracted and analysed data, the file names indicate the conditions under which the films were exposed as follows: film sequence number(s) (03-52); -Dnn.n, SSD in cm; -Fl, load flipped over at half exposure time; -R, load rotated, -T|M|B, top, middle or bottom plane of the load; -kVnnn, anode voltage in kV; -Ann.n, anode current in mA; -snnn, exposure time in seconds; -dnn, load depth reduced to, in cm; -r2, load displaced 2 cm right relative to initial exposures. Excel file names include a final component -6|6g indicating that 6 × 6 blocks of pixel values were added to reduce the final resolution to 2mm, g indicating the color channel. File name elements are excluded where they do not apply.

本研究针对一款用于昆虫辐照的新型低温X射线辐照系统开展剂量学评估。该系统每周可对多达4000万只不育雄蚊进行辐照，其剂量均匀性比（Dose Uniformity Ratio，DUR）可达1.3及以上。剂量测量采用Gafchromic™ EBT-XD辐射变色胶片：在辐照完成24小时后以75 dpi分辨率进行扫描，并将图像的颜色通道信息导出至Excel文件进行后续处理。本数据集包含TIFF格式的扫描文件与经提取、分析后的Excel数据文件，文件名可反映胶片辐照时的各项实验条件，具体命名规则如下：胶片序列号（范围03-52）；-Dnn.n：源皮距（Source-Skin Distance，SSD），单位为cm；-Fl：加载件在辐照时长一半时翻转；-R：加载件发生旋转；-T|M|B：分别对应加载件的顶面、中部与底面；-kVnnn：阳极电压，单位为kV；-Ann.n：阳极电流，单位为mA；-snnn：辐照时长，单位为秒；-dnn：加载件厚度缩减至指定值，单位为cm；-r2：加载件相较于初始辐照位置向右偏移2 cm。Excel数据文件的名称末尾带有后缀-6|6g，其中“6”表示将6×6像素块的像素值求和以将最终分辨率降至2mm，“g”代表所用的颜色通道；若某参数不适用，则文件名中省略对应元素。