If you want to detect and measure rocks, antique watches, antique ceramics, etc., you need an accurate Geiger counter with four types of radiation. If one wants to check radiation from nuclear power plants, the Geiger counter should allow for continuous monitoring. The SBM20 is less sensitive than the LND-712 and is more easily damaged. The SBM20 detects alpha, beta, gamma, and x-rays. LND-712 measures α, β, γ, and X-rays but is less sensitive than LND-7317. The LND-7317 has the highest sensitivity but is easily damaged. There are 4 common tube models, LND-7317, LND-712, SBT-11 and SBM20-1. Under the same conditions, a good Geiger counter might be able to count 1000 particles, while the low-end one can only count 500 particles. The sensitivity of Geiger counters may vary.Ī Geiger counter is more sensitive if it can count more particles. If you are looking for protection, it should be able to detect beta, gamma, and X-rays. The best one can detect and measure four types of radiation: alpha, beta, gamma, and X-rays, while some can only detect beta, gamma, and x-rays. The ability to measure radiation usually depends on the Geiger-Mueller tube. The number of clicks is a rough indication of how much radiation is present.īefore the counter detects radiation, it needs to be restored to its original state by quenching to counteract the effects of the Geiger discharge. If you connect a megaphone, you can hear a loud click each time a particle is detected. Many electrons travel down the wire, creating a burst of current. Thus, even a single radiating particle can produce electrons in rapid succession, which is called a Geiger discharge. The metal wire runs at a high positive voltage.Īs the electrons go to the metal wire, some electrons collide with other gas molecules such that they split into ions and more electrons. The electrons are attracted to a metal wire inside the tube. Positive ions are attracted to the outside of the tube. Some gas molecules become positive ions and electrons. When the radiation collides with the gas molecules inside the tube, it causes ionization. The radiation enters the window at the end of the tube. The radiation moves randomly outside the detection tube.
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