Related Experiment Video
Updated: Jul 13, 2025

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
Published on: April 28, 2022
Photon spectra in NPL standard monoenergetic neutron fields
N J Roberts1, A Bennett1, S S Cheema1
1National Physical Laboratory, Nuclear Metrology Group, Hampton Road, Teddington, Middx. TW11 0LW, United Kingdom.
Abstract:
A High Purity Germanium (HPGe) detector has been used to measure the photon spectra in the majority of monoenergetic neutron fields produced at NPL (0.144, 0.250, 0.565, 2.0, 5.0 and 16.5 MeV). The HPGe was characterised and then modelled to produce a response matrix. The measured pulse height spectra were then unfolded to produce photon fluence spectra. The new spectra were used to improve the photon to neutron dose equivalent ratios from some earlier work at NPL with Geiger-Muller tubes and electronic personal dosemeters.
Related Concept Videos
Emission Spectra
Atomic Nuclei: Nuclear Spin State Population Distribution
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
Atomic Spectroscopy: Absorption, Emission, and Fluorescence
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...
Nuclear Overhauser Enhancement (NOE)

