Perec A, Kubo H
University of Rochester Cancer Center, Department of Radiation Oncology, NY 14642.
Int J Radiat Oncol Biol Phys. 1990 Aug;19(2):483-4. doi: 10.1016/0360-3016(90)90561-w.
A digital constancy meter which has been used in our institution uses a plane-parallel chamber for daily morning output checks of treatment machines. After exposure, the user has to enter the treatment room to obtain the charge reading and reset the meter for the next reading. To avoid this extra step and save time, a remote reset circuit which includes a light-dependent-resistor (LDR), was built into the meter. When the room light is turned off (or dimmed) from the console, the light-dependent-resistor will trigger a circuit which will reset the meter.
我们机构使用的一种数字剂量仪，在日常对治疗机的早晨输出剂量检查中使用平行板电离室。照射后，用户必须进入治疗室获取电荷读数并为下一次读数重置剂量仪。为避免这一额外步骤并节省时间，剂量仪中内置了一个包括光敏电阻（LDR）的远程重置电路。当通过控制台关闭（或调暗）房间灯光时，光敏电阻将触发一个电路来重置剂量仪。
