At the diagnostic reference level (DRL) related to medical radiation, DRL quantity for general radiography is the entrance surface dose (ESD). Calculation of the ESD in medical radiography requires the backscatter factor (BSF), but derivation of the BSF requires assessment of an irradiated simulation of a human body. The present study used optically stimulated luminescence (OSL) dosimeters and an anthropomorphic phantom as the irradiated body, and the BSF was calculated for different half value layer (HVL)s and field sizes. The need for different BSFs for different regions was also investigated by derivationing of the BSFs for different regions. The pelvis of a RANDO phantom was irradiated under the conditions of the HVL of 2.0, 3.1, and 4.6 mmAl; tube current of 200 mA; irradiation time of 0.1 s; source surface distance of 100 cm; and field sizes of 10נ10 cm², 20 cm², 30 cm², and 40 cm². Measurement in air was performed under the same conditions. Several threads were stretched through the air with tissue paper placed on them and the nanoDot dosimeters placed on the paper. Four dosimeters were placed, and measurement was performed 5 times under each set of conditions. The compared radiographed regions were the skull, chest, and pelvis. The BSF increased with increasing HVL size and with increasing field size. The larger the HVL, the larger the difference between field sizes of 10נ10 cm² and 40נ40 cm² and the larger the increase in BSF relative to the increase in field size. The BSF differed by region, from large to small in the order chest, pelvis, and skull. The results thus showed that the BSF differs by the radiographed region. Thus, it is desirable to determine the BSF in each radiographed region by investigation with an anthropomorphic phantom.

在与医疗辐射相关的诊断参考水平 (DRL) 上，一般 X 线摄影的 DRL 量是入射表面剂量 (ESD)。医学射线照相中 ESD 的计算需要反向散射因子 (BSF)，但 BSF 的推导需要评估人体的辐射模拟。本研究使用光受激发光 (OSL) 剂量计和拟人化体模作为照射体，计算不同半值层 (HVL) 和射野大小的 BSF。还通过推导不同地区的 BSF 来研究不同地区对不同 BSF 的需求。在 HVL 为 2.0、3.1 和 4.6 mmAl 的条件下照射 RANDO 体模的骨盆；管电流200毫安；照射时间为 0.1 s；源面距离为 100 cm；2、20 厘米²、30 厘米²和 40^厘米2。在相同条件下进行空气中的测量。几根线在空气中伸展，上面放着薄纸，纸上放着 nanoDot 剂量计。放置4个剂量计，在每组条件下进行5次测量。比较的射线照相区域是颅骨、胸部和骨盆。BSF 随着 HVL 大小的增加和场大小的增加而增加。HVL 越大，10נ10 cm ²和 40נ40 cm ^{2的射野尺寸差异越大}并且相对于字段大小的增加，BSF 的增加越大。BSF 因区域而异，从大到小依次为胸部、骨盆和颅骨。因此，结果表明 BSF 因射线照相区域而异。因此，希望通过使用拟人化体模进行研究来确定每个射线照相区域的 BSF。