SINGLE DIODE DETECTOR FOR INDIVIDUAL NEUTRON DOSIMETRY USING A PULSE-SHAPE ANALYSIS

A new method using one PN junction covered with a hydrogenous converte r (B-10-loaded) is proposed for individual neutron dosimetry. This met hod is based on a pulse shape analysis to discriminate the photon sign al from the neutron signal. This method allows drastic reduction of th e photon sensitivity (by a factor of 1000). Additionally, when using a photon correction factor, the photon response becomes negligible. By applying a neutron correction factor to the low energy events, the gap in neutron sensitivity for intermediate energy can be partly filled. Lead shields used to surround the detector allow the remaining photon sensitivity to be decreased by a factor of two. An especially designed hydrogenous moderator placed at the top of the detector allows the ne utron sensitivity to be increased by a factor of two for 250 keV neutr on energy.