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The Radiation Physics Division's accelerator facilities continue to support a broad range of research efforts in the areas of industrial and medical dosimetry
We collaborated on tests at the Insitut Laue Langevin (ILL) to study the effects of high flux neutron beams on spin-exchange optical pumping (SEOP). The key
We continue to work improving techniques in fast neutron detection using segmented spectrometers based on the principle of capture-gating. Our approach employs
Neutron detectors based on UV scintillations in xenon gas are under development for a variety of applications. The scintillations are produced with high
The detection of low energy charged particles is essential to high precision fundamental physics experiments, particularly with neutron beta decay. The majority
The capabilities of many neutron scattering instruments would be greatly enhanced by neutron polarization analyzers that can cover a wide angular range.
Operation of the second neutron radiative decay experiment was completed. In the experiment we observed the emission of photons that accompany neutron beta
The Alpha-Gamma device is a totally-absorbing neutron detector that has been used to measure the absolute neutron fluence of a cold, monoenergetic neutron beam
The National Institute of Standards and Technology (NIST), Radioactivity Group, and the National Physical Laboratory (NPL) of the UK, exchanged 210Pb solution
Liquid scintillators have been at the heart of radiation measurements at NIST for decades. NIST scientists have pushed the limits of liquid scintillation-based
Measurements of radium isotopes in the naturally-occurring radioactive decay chains (i.e., 235U, 238U, and 232Th) are exceedingly important for various
Members of the Radioactivity Group (RG) have been actively collaborating with statisticians in the NIST Statistical Engineering Division to identify new tools
Ni-63 is of considerable interest and importance in radionuclidic metrology as well as for radiation protection surveillance around nuclear facilities.
Collaboration on investigating the thermodynamics of radon binding with a new and novel class of cryptophane molecules was completed with researchers from the
A new standard solution of 243Am, an important radionuclide for the US and international environmental-measurements communities, was developed and disseminated
Since the 1950s, the NIST Radioactivity Group has employed standardized 5 mL borosilicate glass ampoules for ionization chamber measurements and high-resolution
The construction of a new primary calibration facility for air kerma measurements has been completed. It delivers a collimated 137Cs gamma-ray beam in which
Check standards are used by the NIST Radiation Physics Division to monitor the performance of the alanine dosimetry system that is central to its high-dose
The high-dose dosimetry program supports radiation-processing applications by assuring that the absorbed dose to the product, often prescribed or limited by
NIST continues to be deeply involved with measurements and evaluations of neutron cross section standards. NIST maintains a limited experimental effort focused
Standard-sized ampoules for radioactive solution standards have been employed by the National Institute of Standards and Technology (NIST) for the past 70 years