Profile: ICD Electronics offers radiation dosimeters. Our RD01 radiation dosimeter is easy to use, compact and lightweight dosimeters. It includes LCD display with battery operation and audible alarm with increased radiation. RD01 is a compact and exact device that operates with Geiger Muller tube. It is very easy to use and gives precise measurements displayed on the 2 digit LCD. Gamma rays are electromagnetic rays formed during physical phenomena which take place within the nucleus of the atom. Gamma rays can produce ions directly or indirectly while they travel through matter. X rays are similar to gamma rays but are formed by physical phenomena occurring within the electronic structure of the atom. They are used for medical purposes and are rarely found in nature.