Ion Chamber Metal Geiger Counter Check Fire Alarm Security System Source Smoke Tester Sensor


Local Warehouse
Cheapest Prices Worldwide
Fast Postage Available
100% Customer Satisfaction
Quality Guarantee
Buy Direct From Supplier
Hurry up! Just 12 items left in stock


This sensor contains tiny amount of Americium 241 isotope.

Americium emits alpha particles and weak gamma radiation, alpha particles completely blocked by the casing of the sensor, gamma radiation however freely passes through the casing but due to very low energy around 60 keV quickly absorbed by air (maximum run through air 15cm).

It is a great source for checking gamma only sensitive Geiger counters, if you have such type of counter it will be impossible to test it with other sources which emit beta particles only.

It could be used to test gamma spectrometers as well.

Add a nice "hot" piece to your collection which emits alpha and gamma radiation.

SBM-20 tube based Geiger counter indicates 140 Counts per minute from this source with gamma filter applied (approximately 80 uR/h or 0.8 uSv/h accordingly).


Ionization source characteristics and radiation safety performance:

The ionization chamber fitted with a high performance and low activity of Am-241 ionization

Ionization source activity: 0.5uCi ( 18KBq ) 0.8uCi±10% ( 30KBq±10% )

Ionization source a spectroscopy: peak: 4.5MeV ± 10%, FW HM<0.7MeV

Safety grading standards ( GB4075, IS02919 ) C64444

Ionization chamber radiation dose rate at 25cm: 0.03mGy/ (1mGy value lower than population dose standard)

Ionization chamber specification, parameter:

Conditions: outer electrode and the source electrode voltage ( VDD supply voltage ): 9V

Environment temperature: 20 + C: close to atmospheric pressure standard atmospheric pressure, clean air

Collecting electrode equilibrium potential: 5.3~6.5V

Collecting electrode potential with the smoke concentration change

Light reduction rate was 1% feet: 0.6V

Light reduction rate was 4% feet: 2.2V

Insulator leakage current ( Max ): 0.5Pa

Capacitor ( collection of extreme outer electrode + to the source base ): 6.0pF

Material: Metal

Color: Silver

Size: 28 x 16 x 37mm / 0.8" x 1.1" x 0.5"

Package included:

1 x Smoke tester sensor