Singh Sunil K, Kulkarni M S
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai-85, India.
Homi Bhabha National Institute, Anushaktinagar, Mumbai-94, India.
Radiat Prot Dosimetry. 2019 Jun 1;183(4):468-473. doi: 10.1093/rpd/ncy171.
A thin and plane wall ionisation chamber having 900 cc volume was designed and fabricated to study the calibration coefficient dependency on ionisation chamber wall thickness for directional dose equivalent rate (Ḣ'(d)) at various low and medium energy X-ray beam qualities. Optimised wall thickness was established through measurements to achieve a near flat energy response using the developed ionisation chamber. The measurement shows that in the energy range 12-213 keV, the average calibration coefficient for directional dose equivalent rate lies within ±10% for wall thickness 1.2 mg/cm2 and 480 mg/cm2 (4 mm poly methyl methacrylate) for skin and eye lens dose monitoring, respectively. The study could be useful for the estimation of skin and eye lens doses for the paramedical staff and patient during the interventional radiology and interventional cardiology procedures by monitoring the directional dose equivalent rate.
设计并制造了一个体积为900立方厘米的薄壁平板电离室，用于研究在各种低能和中能X射线束质条件下，校准系数对定向剂量当量率（Ḣ'(d)）电离室壁厚度的依赖性。通过测量确定了优化的壁厚度，以便使用所开发的电离室实现近乎平坦的能量响应。测量结果表明，在12 - 213 keV的能量范围内，对于皮肤和晶状体剂量监测，分别采用1.2毫克/平方厘米和480毫克/平方厘米（4毫米聚甲基丙烯酸甲酯）的壁厚度时，定向剂量当量率的平均校准系数在±10%以内。该研究对于通过监测定向剂量当量率来估算介入放射学和介入心脏病学程序中医护人员和患者的皮肤和晶状体剂量可能是有用的。
