Sarti G, Del Dottore F, Fabbri C, Tassinari L, Pagan S, Rustignoli M, Motta P
Division of Medical Physics, Bufalini Hospital, Via Ghirotti 286, 47023 Cesena, Italy.
Radiat Prot Dosimetry. 2011 Mar;144(1-4):521-4. doi: 10.1093/rpd/ncq331. Epub 2010 Oct 28.
Unsealed beta-gamma-emitting sources are used (15 GBq (90)Y each session) in nuclear medicine therapeutic procedures. Inside the manipulation cell and while giving the injection to the patient, the skin exposure is very high; electron radiation field is not homogeneous and thus the exposure of the extremities is not uniform. Particular individual monitoring is adopted: single thermoluminescence dosemeter, wrapped in polyethylene film and placed on an adhesive tape, is positioned on the tip of the fingers; 6-10 dosemeters are assigned to each operator per session. The energy and angle response is studied for X-ray spectra, (90)Sr/Y and (204)Tl--a unique mean calibration factor is calculated in order to estimate H(p)(0.07). Performance of dosemeter is analysed according to ISO 62387-1(2007) and the combined uncertainty (calculated using the Monte Carlo method) results lie in the order of 11 %. This method reveals the critical step of manipulation and administration and ensures that dose limits are not exceeded.
在核医学治疗程序中使用未密封的发射β-γ射线源（每次治疗使用15GBq的（90）Y）。在操作室内给患者注射时，皮肤暴露剂量非常高；电子辐射场不均匀，因此四肢的暴露情况也不一致。采用了特殊的个人监测方法：将单个热释光剂量计包裹在聚乙烯薄膜中，用胶带固定，放置在手指尖上；每次治疗为每个操作人员分配6 - 10个剂量计。研究了X射线光谱、（90）Sr/Y和（204）Tl的能量和角度响应，计算了一个独特的平均校准因子以估算H(p)(0.07)。根据ISO 62387 - 1(2007)对剂量计的性能进行了分析，组合不确定度（使用蒙特卡罗方法计算）结果约为11%。该方法揭示了操作和给药的关键步骤，并确保不超过剂量限值。
