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Photon Spectra in NPL standard radionuclide neutron fields

Roberts, N J (2018) Photon Spectra in NPL standard radionuclide neutron fields. Radiation Protection Dosimetry, 180 (1-4). pp. 62-65. ISSN 0144-8420

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Abstract

A HPGe detector has been used to measure the photon spectra from the majority of radionuclide neutron sources in use at NPL (252Cf, 241Am-Be, 241Am-Li, 241Am-B). The HPGe was characterized then modelled to produce a response matrix. The measured pulse height spectra were then unfolded to produce photon fluence spectra. Changes in the photon spectrum with time from a 252Cf source are evident. Spectra from a 2 year old and 42 year old 252Cf source are presented showing the change from a continuum to peaks from long-lived isotopes of Cf. Other radionuclide neutron source spectra are also presented and discussed. The new spectra were used to improve the photon to neutron dose equivalent ratios from some earlier work at NPL with GM tubes and EPDs.

Item Type: Article
Keywords: HPGe detectors, Radionuclide neutron sources, Photon dose, photon spectra, unfolding
Subjects: Ionising Radiation > Neutron Metrology
Divisions: Chemical, Medical & Environmental Science
Identification number/DOI: 10.1093/rpd/ncx172
Last Modified: 08 Oct 2018 14:29
URI: http://eprintspublications.npl.co.uk/id/eprint/8098

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