Arcovito G, Azario L, Cichocki F, Piermattei A, Rossi G, Galli G
Istituto di Fisica, Università Cattolica Sacro Cuore, Roma.
Radiol Med. 1989 May;77(5):540-3.
Tomographic images with electronic density can be obtained by irradiation with a monoenergetic beam and detection of the scattered Compton photons. The results of a dosimetric study on the beam of an irradiating Compton unit (equipped with two 192Ir 277.5 GBq sources) are here presented. Doses along the central axis of the beam were measured using thermoluminescent LIF-100 dosimeters. Measurements were taken both in water (RFA-3 Therados) and in cork phantoms. Isodose distributions were estimated by reading the automatic photo-densitometry of radiographic films. A simple algorithm for calculating depth dose values was obtained by analyzing experimental data. The mean absorbed dose (mad) in soft tissues (up to 25 cm deep) was 2.81 mGy for a work load of 7.4 X 10(11) Bq min. The mad in standard thorax was calculated also, which amounted to 3.78 mGy.
通过用单能束照射并检测散射的康普顿光子，可以获得具有电子密度的断层图像。本文给出了对一个康普顿辐照装置（配备两个192Ir 277.5 GBq源）束流的剂量学研究结果。使用热释光LIF - 100剂量计测量束流中心轴上的剂量。在水（RFA - 3 Therados）和软木模型中都进行了测量。通过读取射线照相胶片的自动光密度测定来估计等剂量分布。通过分析实验数据得到了一个计算深度剂量值的简单算法。对于7.4×10(11) Bq·min的工作负荷，软组织（深度达25 cm）中的平均吸收剂量（mad）为2.81 mGy。还计算了标准胸部的mad，其值为3.78 mGy。
