Model of gamma compensated ionisation chamber type RC6, made by 20th Century Electronics in 1967. The ionisation chamber contains two oppositely-charged electrodes arranged so that, when the gas is ionised (ie: by X-rays), the ions are drawn to the electrodes, creating a current. This is used as a measure of the intensity of the ionising radiation. The model was made for, and presented to, Gilbert Tomes by his workforce at 20th Century Electronics (Later Centronic Ltd) Model of gamma compensated ionisation chamber type RC6 1967
