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Math Programs & Projects

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Analysis of 3D Elemental Mapping Artifacts in Biological Specimens using Monte Carlo Simulation
Last Updated Date: 10/02/2012

We performed Monte Carlo simulation to demonstrate the feasibility of using the focused ion beam based X-ray microanalysis technique (FIB-EDS) for … more

A Comparison of WD-EPMA Heterogeneity Testing Procedures
Last Updated Date: 10/02/2012

The heterogeneity of the four elements in a TiAl(NbW) SRM 2061 alloy were determined from five specimens with WD-EPMA (wavelength dispersive – … more

Computational Biology: Comarison of Cell Image Segmentation Algorithms
Last Updated Date: 07/10/2012

With the advent of automated data acquisition systems in conjunction with on-line imaging devices, the biological researcher is potentially … more

Absolute Ag108 Characterization Based on Gamma-Gamma Coincident Detection by Two Nai (TI) Detectors
Last Updated Date: 06/27/2012

A two-dimensional analysis of three coincident gamma-rays in 108 Ag m decay, detected by two NaI(Tl) scintillation detectors, allows a direct … more

Quantification of the Alpha Wall Effect in Liquid Scintillation Counting
Last Updated Date: 06/27/2012

A long-standing uncertainty in liquid scintillation (LS) counting has been the possible loss of counting efficiency. 

Primary Radioactivity Standardization of Ni-63
Last Updated Date: 06/27/2012

Ni-63 is of considerable interest and importance in radionuclidic metrology as well as for radiation protection surveillance around nuclear … more

Components of Variance in Liquid Scintillation Counting
Last Updated Date: 06/27/2012

As part of the standardization of the 239 Pu solution that was disseminated by NIST as Standard Reference Material (SRM) 4330C, a detailed study … more

Radon Binding to Water-Soluble Cryptophane
Last Updated Date: 06/27/2012

Collaboration on investigating the thermodynamics of radon binding with a new and novel class of cryptophane molecules is currently underway with … more

New Statistical Analysis Tools
Last Updated Date: 06/27/2012

Members of the Radioactivity Group (RG) have been actively collaborating with statisticians in the NIST Statistical Engineering Division to … more

Technetium-99m Primary Standardization and International Comparison
Last Updated Date: 06/27/2012

Technetium-99m ( 99m Tc) is used in two-thirds of all diagnostic nuclear medicine procedures in the United States. more

International Comparison of Pu-241
Last Updated Date: 06/27/2012

All of the plutonium isotopes, which have a very high biotoxicity, are man-made and result from various nuclear activities. Plutonium-241 is a … more

Blind Measurement Comparisons of the USA and UK Pb-210 National Standards
Last Updated Date: 06/27/2012

The National Institute of Standards and Technology (NIST), Radioactivity Group, and the National Physical Laboratory (NPL) of the UK, and the … more

New Standardization of Ra-228
Last Updated Date: 06/27/2012

Measurements of radium isotopes in the naturally-occurring radioactive decay chains (i.e., 235 U, 238 U, and 232 Th) are exceedingly important for … more

Standardization of Am-243
Last Updated Date: 06/27/2012

A new standard solution of 243 Am, an important radionuclide for the US and international environmental-measurements communities, was developed and … more

NIST Laboratory for Quantitative PET-CT Imaging
Last Updated Date: 06/27/2012

As part of a NIST-wide effort to develop a metrological infrastructure for quantitative medical imaging, the Radioactivity Group has recently … more

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