This genuine IEC instrument simulates a Geiger Counter but without using actual radioactive sources. It is therefore completely safe. Powered by 240/12V.AC. Plug Pak, this microprocessor based instrument can display the counts of particles leaving an imaginary r/a 'source' and also can display the number of r/a particles remaining inside the 'source'. The concept of half-life is easily demonstrated and the random nature of the particle counts can be shown. The unit is used also in Maths in the study of 'random numbers' and statistics.

The instrument is programmed to behave like a Radioactive Source and two different types of source are simulated • Very long half life type: The source appears to be radiating particles and the display appears to be a Geiger Counter that indicates the same reading that would be found on a real Geiger Counter at a certain distance from a real source. These ‘Geiger Counter’ readings are actually random numbers within a window of maximum and minimum. This set of random numbers is useful to be used in mathematics and in theories of probabilities.
• Very short half life type: The display in this case shows the number of particles remaining in the source. Initially the source contains 1.000 x 1020 particles. Eventually, after about 45 minutes, the number of particles remaining reaches one last particle. The time when that last particle will go is indeterminate. The elapsed decay time is also displayed in minutes and seconds for graphs to be plotted which demonstrate and explain the concept of half-life. When the source is exhausted, or at any other time, it can be ‘replenished’, ready for the next experiment, by a simple press on a button.
• Audible monitoring: The ‘clicking’ sound associated with the counting of a Geiger Counter can be turned ON or OFF as desired.
• Fun to use: The “Magic” concept makes the equipment fun to use and the results taken by the student actually work properly. This aspect improves the confidence level of the student.

INPUT: 12V.AC/DC 50/60Hz. Two 4mm sockets are provided on the end of the instrument for connection by banana plugs to a standard school power pack. A socket is provided also for a 240/12V.AC. Plug Pak.