Geiger tube sensors do not ‘fill up’. They are a gas filled ionization chamber, and when a charged particle of ionizing radiation flies thru the tube, it momentarily conducts a tiny spark in the tube that the electronics amplifies as a ‘click’. Thus each radioactive ‘ray’ produces a click on the machine. The tube lasts indefinitely as it quenches after each click. Nothing fills the tube. In heavy radiation, the clicks come fast and furious as a heavy buzz. This intensity can be measured in Roentgens of exposure per minute, or per hour. Thus, a calibrated geiger counter is all you really need. That and a timing clock to measure how long you are exposed to a measured level of radioactivity. That will tell you how much radiation your body has absorbed. This is what a dosimeter does. But you can do the same thing with a geiger counter and clock. There are published radiation absorbtion limits and levels for human exposure. Find the charts. Memorize the levels & times that cause sickness… and death. These are the limits to know. And they can be measured with a geiger counter.
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