In order to turn the unit off, you must flip the tube power switch to OFF while the USB cable is plugged in or while the board is still connected to your power supply. Note: While the Geiger counter is powered and the switch is in the ON position, the board contains exposed high voltage components. Here at SparkFun, on average, we get about 25 counts a minute.Ĭheck out the random number generating Geiger counter tutorial for more information.Īlso, check out the live Geiger Counter feed from SparkFun headquarters. Each bit generated (actually an ASCII byte, 0 or 1) represents an actual event in the tube in real-time, so the output can be used to deduce CPM or what ever units you need. Simply plug the unit into USB (make sure you have FTDI drivers installed), open a terminal program to the correct COM port at 9600bps, and you will see random bits being generated from the random background radiation. This USB powered Geiger Counter is equipped with an ATMega328 that can be programmed in circuit using one of the programmers below. This version also includes the necessary capacitor to support Arduino's auto-reset feature. We've revised the Geiger counter once again, this time replacing the switch with a more robust right angle switch. We've taken your advice and revamped the power supply and also changed the signal capture from the tube. Internal exposure to Cs-137 through ingestion or inhalation allows the radioactive material to be distributed in the soft tissues, especially muscle tissue, which increases cancer risk.Replacement: SEN-11345. Large amounts of Cs-137 are not found in the environment under normal circumstances.Įxposure to Cs-137 can increase the risk for cancer because of the presence of high-energy gamma radiation. Exposure to such a large amount could come from the mishandling of a strong industrial source of Cs-137, a nuclear detonation or a major nuclear accident. Other industrial devices that measure the thickness of materials such as paper or sheets of metal.Įxternal exposure to large amounts of Cs-137 can cause burns, acute radiation sickness and even death.Industrial gauges that detect the flow of liquid through pipes.Medical radiation therapy devices for treating cancer.Cesium-137 is used in small amounts for calibration of radiation detection equipment, such as Geiger-Mueller counters.
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