THE RECOMBINATION CORRECTION FOR AN IONIZATION-CHAMBER EXPOSED TO PULSED RADIATION IN A SWEPT BEAM TECHNIQUE .1. THEORY
THE RECOMBINATION CORRECTION FOR AN IONIZATION-CHAMBER EXPOSED TO PULSED RADIATION IN A SWEPT BEAM TECHNIQUE .1. THEORY
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DOI：
10.1088/0031-9155/27/2/001
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发表时间：
1982-01-01
影响因子：
3.5
通讯作者：
BOAG, JW
中科院分区：
文献类型：
--
作者：
BOAG, JW
已建立的理论的收集效率的电离室照射的一系列均匀的短脉冲扩展到更复杂的情况下的照射在一个脉冲和电磁扫描电子束。假设曝光率的径向变化是高斯的，尺度常数等于α，并且假设脉冲均匀分布在扫过的区域上。导出了收集效率的公式，并研究了改变某些参数的影响。如果已知两个剂量计读数Q1和Q2（在两个非常不同的电离室电压V1和V2下），则可以计算电压V1下的收集效率phi 1，φ 1主要取决于比值Q1/Q2和V1/V2，并在较小程度上取决于腔室的几何形状或高斯尺度常数与扫描场的典型线性尺寸的比率。提供了计算phi 1的图表。
The established theory for the collection efficiency of an ionisation chamber irradiated by a series of uniform short pulses is extended to the more complex case of irradiation in a pulsed and electromagnetically swept electron beam. The radial variation of exposure rate is assumed to be Gaussian with scale constant equal to a, and the pulses are assumed to be uniformly distributed over the area swept out. A formula for the collection efficiency is derived and the influence of varying some of the parameters is studied. The collection efficiency, phi 1, at voltage V 1 can be calculated if the two dosemeter readings, Q 1 and Q 2, at two widely different chamber voltages, V 1 and V 2, are known, phi 1 depends primarily upon the ratios Q 1/Q 2 and V 1/V 2 and to a much lesser extent upon the geometry of the chamber or the ratio of Gaussian scale constant to a typical linear dimension of the field scanned. Charts for calculating phi 1 are provided.