S Detection of thermal neutrons in pulse This characteristic depends on the electronic equipment associated to the detector and the conditions of measurement. The figures have been determined with a Merlin-Gerin type SAITB equipment, working in current amplification (G = 80 dB) with a Characteristic depending on the electronic equipment associated Value depending on the associated electronic equipment and the acceptable counting losses. Standard counting measurement conditions. Under radiation, gamma rays generate low amplitude pulses which are not counted due to the discrimination threshold. For dose rate more than 10 Gy.h"1, pulse overlapping occurs which increases the counting rate without correlation with the neutron flux. The insulating resistance is measured between anode and cathode at 800 V, with polarity (+) on the anode. CAUTION: a wrong polarity could destroy the anode. Disappearing of C02 induces an increase of the charge collection The use of high purity aluminium further reduces the material activation after exposition to neutrons. On request this type of counter can be supplied with an integrated Including temperature increase due to gamma radiation (effective above 10 gy.h"1). The leakage current in the connection cable increases rapidly with temperature. It is therefore necessary to take into account this characteristic, which limits the maximum temperature so that the ratio of wanted signal/parasitic signal remains acceptable. Consider CPNB24 detector if integral cable 1 Vibration test conditions : frequency 60 Hz , amplitude ± 1 mm.

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