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Re-calibration and Monte Carlo modelling of the NPL counters.

Tagziria, H; Thomas, D J (1998) Re-calibration and Monte Carlo modelling of the NPL counters. NPL Report. CIRM 19

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The Monte Carlo technique has become a very powerful tool in radiation transport as full advantage is taken of richer cross section data, more powerful computers and Monte Carlo techniques, high quality physics, and better known neutron and photon source spectra. At the National Physical Laboratory calculations using the Monte Carlo radiation transport code MCNP have been combined with accurate measurements to characterise two long counters routinely used to standardise monoenergetic neutron fields. New and more accurate response function curves have been produced for both long counters. A novel approach using Monte Carlo methods has been developed, validated and used to model the efficiency of the counters and to determine more accurately their effective centres, which have always been difficult to establish. Calculations and measurements agree well, especially for the De Pangher long counter for which details of the design and constructional material are well known.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CIRM 19
Subjects: Ionising Radiation
Last Modified: 10 Sep 2018 14:07
URI: http://eprintspublications.npl.co.uk/id/eprint/1020

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