IONIZATION CHAMBER TYPE RADIATION DETECTOR

摘要

PURPOSE:To directly perform measurement regarding 1cm deep dosage equivalent and to perform this measurement correctly by providing an adjusting board made of a metal board of a specific area and low energy adjusting films formed on the adjusting board. CONSTITUTION:An adjusting board 20 is provided on a collector 14 while the collector 14 is equipped with a disc part 14b at the tip of its support 14a wherein circular adjusting boards 20a, 20b having the same area are respectively adhered to the surface and the rear of this disc part 14b and further low energy adjusting films 22a, 22b are overlappingly formed on them. Since the adjusting board 20 is made of a metal board, radiation incident to the adjusting board 20 is to generated electron beam mainly by photoelectric effect in a low energy region and by mainly by Compton effect in an intermediate energy region so that radiation corresponding to 1cm deep dosage equivalent can be measured by these functions. Thus the value of 1cm deep dosage equivalent can be directly measured and can be correctly measured.