NAP-07 HIS-07 Smoke Sensor

Metal Geiger counter controller, Test source is a Lionization Chamber with smoke detector or sensor. HIS-07 smoke sensor using radiation from a small amount of Americium-241. This radiation hits dust particles in the air, and the number of these collisions is calculated as the amount of smoke in the air.

Americium emits alpha particles and weak gamma radiation, alpha particles are detected by the casing of the sensor. is completely blocked, but gamma radiation passes freely through the case but is quickly absorbed by the air due to the very low energy of around 60 keV (maximum flux in air 15cm). It is a great source for checking Geiger counters that are only sensitive to gamma, if you have such a meter it will be impossible to test it with other sources that emit only beta particles.

Testing gamma spectrometers It can also be used to. The SBM-20 tube-based Geiger counter displays 140 Counts per minute from this gamma-filtered source (approximately 80 uR/h or 0.8 uSv/h).