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An average natural background radiation count can be between five to sixty counts per minute. Fortunately, most counters have a built-in count per minute digital display setup to count and show the CPM or CPS value.ĭue to background radiations, the Geiger counter starts to make a beeping sound as soon as it’s switched on. Count the number of beeps for any fixed interval of time and then divide the beep count with time to get counts per minute. Whenever an ion pair is made, a beep sound can be heard, and that counts one. When ionizing radiations ionize the gas present in the tube, then these ions move toward the electrodes and make ion pair there. Geiger counter normally presents ionizing radiations in counts per minute (CPM) or counts per second (CPS). Be sure of making proper unit conversion before making any decision. It means if your Geiger counter shows the unit of counts per min (CPM) and any reference chart or table you have has the unit of counts per second (CPS), be careful.
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Geiger counter can measure ionizing radiations in many different units, like in counts per minute (CPM), micro Sieverts per hour (µS/h) or in micro roentgen per hour (µR/h).īe sure of the unit reading displayed on the counter display and the unit you are considering for the chart reference. The larger the tube is the higher sensitivity the Geiger counter will have. The sensitivity of the counter largely depends on the size of the tube. Hold it still for a while to measure background radiation and then use it to measure radiation coming from radioactive material. To take a reading using the Geiger counter simply turn on the counter in order to apply a high voltage across both electrodes of the tube. Geiger counter has blinking light whose blinking speed changes as it detects radiations, it is also supported with a beeping sound. If there are ionizing radiations coming from subjected material or in the environment, then the electric circuit of the Geiger tube can detect them using its tube and electric circuit. To accurately measure radiation, you need to know how to read the Geiger counter for any radiation type. Geiger counter is quite easy to handle and only needs related technical knowledge about the type, nature, energy level of radiation, and how to safely measure the specific type of radiation coming from a radioactive source.
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