SYSTEM FOR MEASURING RADIOACTIVITY IN A GAMMA BACKGROUND NOISE

摘要

The present invention relates to a method and a device for measuring alpha and / or beta radioactivity in a gamma background noise comprising a compensation probe comprising a first sensor for measuring alpha and / or beta and gamma radioactivity ( a, b, g) and a second sensor that does not allow the measurement of alpha and / or beta radioactivity but allows the measurement of gamma radioactivity (g); characterized in that the sensors are arranged to be exposed substantially to the same gamma background noise; measurement biases being associated with the geometric arrangement of the sensors due to the anisotropy of the gamma radiation; the measuring system determines the alpha and / or beta (a, b) radioactivity by compensation, said compensation comprising a subtraction between the measurement of alpha and / or beta and gamma radioactivity (a, b, g) and the gamma measurement (g ), said compensation minimizing the measurement bias associated with the geometric arrangement of the sensors. Other developments are described to improve the reliability of radioactivity measurements.