How does the radiation dose level affect my selection?
As a rule of thumb the higher the dose rate level the less volume you need inside the Geiger counter tube. The larger the volume of gas in the tube the more sensitive it will be and hence as the radiation increases the quicker the Geiger will go into saturation. Once the Geiger saturates it becomes non linear and is no longer useful as a measuring device, so it is always important to consider very carefully the dose rate range over which you need to use the device to always ensure it is in the unsaturated state no matter what the dose rate. Very high dose rates will require a small volume tube like the ZP1300 for example.
