METODA UNTUK REGULASI DAN DISKRIMINASI BENTUK PULSA DALAM SISTEM SPEKTROSKOPI NUKLIR

摘要

The present invention is based on a digital pulse sampling and detection technique which samples a nuclear pulse train at a constant frequency asynchronously with the actual pulses, which occur at random times. The shape of pulses representative of the interaction of nuclear particles or gamma-rays with a nuclear detector is analyzed to determine the pulse length. Nuclear particles or gamma-rays are detected. A signal is formed containing pulses representative of the particles or gamma- rays. The pulses are sampled at a constant frequency to form a digital image of the pulse train. The pulse length is determined by counting the number of pulses with a first number of consecutive samples above a threshold and by counting the number of pulses with a second number of consecutive samples above the threshold. A ratio of the first and second number of consecutive samples is obtained. The ratio is used to adjust the pulse length.