Related Experiment Video
Updated: May 7, 2026

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Photon doses in NPL standard neutron fields
N J Roberts1, N A Horwood2, C J McKay2
1National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK neil.roberts@npl.co.uk.
Abstract:
Standard neutron fields are invariably accompanied by a photon component due to the neutron-generating reactions and secondary neutron interactions in the surrounding environment. A set of energy-compensated Geiger-Müller (GM) tubes and electronic personal dosemeters (EPDs) have been used to measure the photon dose rates in a number of standard radionuclide and accelerator-based neutron fields. The GM tubes were first characterised in standard radioisotope and X-ray photon fields and then modelled using MCNP to determine their photon dose response as a function of energy. Values for the photon-to-neutron dose equivalent ratios are presented and compared with other published values.
Related Concept Videos
Nuclear Stability
To hold positively...
Atomic Nuclei: Nuclear Spin State Population Distribution
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
Biological Effects of Radiation
Nuclear Overhauser Enhancement (NOE)
Nuclear Transmutation

