Morikawa K, Ishimatsu K
Hiroshima City Asa Hospital.
Radioisotopes. 1990 Feb;39(2):37-44. doi: 10.3769/radioisotopes.39.2_37.
Neutron dose equivalent rates are measured in the irradiation room and the maze of a medical electron accelerator facility. An m-counter used for measurement is associated with a gate circuit to reject piled up signals caused by pulsed X-rays, so that it is possible to measure the neutrons without obstruction by the piled up signals even in the irradiation room. Counting loss of neutrons is mathematically corrected, and the correction factor comes nearly equal to 1.5 at dose points close to the entrance to the irradiation room when 14 MV X-rays are generated. The measurement in the maze agrees with the calculation reported in the preceding report in a factor less than 1.5 except for dose points close to the entrance to the irradiation room.
在医用电子加速器设施的辐照室和迷宫中测量中子剂量当量率。用于测量的m计数器与门电路相关联，以抑制由脉冲X射线引起的堆积信号，从而即使在辐照室中也能够不受堆积信号的阻碍测量中子。中子的计数损失进行数学校正，当产生14 MV X射线时，在靠近辐照室入口的剂量点处校正因子接近1.5。除了靠近辐照室入口的剂量点外，迷宫中的测量结果与前一份报告中报道的计算结果在小于1.5的因子范围内一致。
