Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1885288 | Radiation Measurements | 2010 | 5 Pages |
Abstract
A moderator-type neutron monitor has been developed, which registers delayed beta rays from neutron-induced silver activation and which is able to measure dose equivalent in pulsed fields with peak dose rates of several thousand Sv hâ1. The monitor uses four silicon diodes in the centre of a polyethylene moderator, 30 cm in diameter. Two of the diodes are covered by natural silver foils and two of them by tin foils. The latter are used to subtract photon-induced pulses. For registering signals, a pulse height threshold is set at 662 keV, which minimizes the effect of 137Cs and lower energy radiation and - in addition - enhances the detection of beta rays from the shorter half-life silver isotope 110Ag (25 s) as compared to the longer half-life isotope 108Ag (144 s). The results of measurements in neutron and photon calibration fields, of MCNPX neutron response calculations and of first measurements in a high-intensity pulsed field at the PSI accelerator are shown.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
M. Luszik-Bhadra, E. Hohmann, Th. Otto,