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近年来由于地震工作的推动,中国射气测量技术得到了较大的进展。七十年代初期,我国自己设计的FD-125型室内氡钍分析器即已得到国内外地震和找矿工作者的好评。该仪器的球形闪烁室被萤光片分隔为四个互相联通的小室,含氡气体进入后探测效率较高,在闪烁室充射气一小时后,测量时间100秒,闪烁室测镭的系数约1.4×10~(-13)克镭/脉冲。有可转动的放置测量和待测量的闪烁室的圆盘,测量完毕的闪烁室可迅速换下,使一已避光待测的闪烁室转入正对探头的进行测量位置,仪器使用效率很高,每天可测数十个样品。由于瞬时采取的数10至100毫升小体积样品测得的数据对地震工作来讲代表性不强,误差大,所以近年又研制了各种改进装置,有的在现场连续自记或间断定时测量,有的加大样品体积,有的测量一段时间内的累积射气强度。测量原理有测氡衰变过程中射出的能量较大的α粒子的,有测穿透性较强的γ射线的;α
In recent years due to the promotion of earthquake work, China’s radiometric measurement technology has made great progress. In the early 1970s, China’s own design of the FD-125 indoor radon thoron analyzer that has been the earthquake and prospecting workers at home and abroad. The spherical scintillation chamber of the instrument is divided into four interconnected cells by a fluorescent plate, and the detection efficiency is high after the radon-containing gas enters. After one hour of scintillation chamber inflation, the measurement time is 100 seconds and the coefficient of the scintillation chamber radium detection About 1.4 × 10 ~ (-13) grams of radium / pulse. There is a rotating disc placed in the measuring and scintillation chamber to be measured, the measured scintillation chamber can be rapidly replaced, so that a blinking room in which the light is to be measured is transferred to the measuring position facing the probe, the use efficiency of the apparatus is very high High, measurable dozens of samples a day. Due to the fact that the measured data of 10 to 100 milliliters of small samples taken instantaneously are not very representative and have large errors in seismic work, various improved devices have been developed in recent years, and some have been making continuous self-recording or intermittent time measurement in the field , Some increase the sample size, and some measure the accumulated gas intensity over a period of time. Measurement principle Measured radon decay process emits larger energy α particles, a strong penetrating γ rays; α