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Calibration and Monte Carlo modelling of the NPL long counters at 22.8 keV.

Tagziria, H; Roberts, N; Bennett, A; Thomas, D J (2001) Calibration and Monte Carlo modelling of the NPL long counters at 22.8 keV. NPL Report. CIRM 48

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Abstract

An extensive programme was successfully carried out during the 1995 to 1998 NMS programme to re-calibrate and model by Monte Carlo simulations the characteristics of two NPL long counters that are routinely used to standardise neutron fluences [Ta98, Ta00] for neutron energies above 500 keV. The present work is a continuation of it in that the counters responses and effective centres have been measured and simulated for a neutron energy of 22.8 keV using an antimony-beryllium (124SbBe) photon-neutron source. The neutron source emission rate was measured using the manganese sulphate bath technique. The efficiency and effective centres of both counters have been measured in a low scatter facility at NPL and calculations have been performed using MCNP4C.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CIRM 48
Subjects: Ionising Radiation
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2107

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