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Physics Programs & Projects

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Secondary Standards for Ra223
Last Updated Date: 06/27/2012

223 Ra is being evaluated as a radiopharmaceutical for the treatment of skeletal metastases.   As an alkaline earth metal, Ra exhibits intrinsic … more

Shellfish Natural Matrix Radionuclide Standard Reference Material 4358
Last Updated Date: 06/27/2012

This Standard Reference Material (SRM) has been developed in cooperation with member laboratories of the International Committee for Radionuclide … more

Radionuclide in Soil Reference Materials
Last Updated Date: 06/27/2012

Consequence management of a radiological incident requires rapid information about the nuclides, amount, dispersion, and speciation for the … more

Gamma-ray Spectrometry System
Last Updated Date: 06/27/2012

A new silicon detector for calibration of low energy gamma-ray emitting sources used for nuclear power plants, medical and homeland security … more

Separation and Purification of Ra-228 for SRM 4339B
Last Updated Date: 06/27/2012

The US Environmental Protection Agency (USEPA) maximum contaminant level for combined 226 Ra and 228 Ra in drinking water is 5 picocuries (37 mBq) … more

National Technical Nuclear Forensics CRMs
Last Updated Date: 06/27/2012

The U.S. Department of Homeland Security (DHS) is committed to using cutting-edge technologies and scientific talent in its quest to make America … more

Active Interrogation Standards
Last Updated Date: 06/27/2012

Active interrogation involves directing nuclear radiation into a closed container and measuring secondary radiations to gain information about the … more

The Urgent Requirements for New Radioanalytical CRMs
Last Updated Date: 06/27/2012

A multi-agency workshop was held from 25–27 August 2009, at the National Institute of Standards and Technology (NIST), to identify and prioritize … more

Development of Epoxy Based Ge-68 Standard Phantom Sources
Last Updated Date: 06/27/2012

The use of imaging data for staging of disease, treatment planning, and monitoring of patient response continues to increase. In these types of … more

A Novel Optical Technique for Rapid Detection of Neutrons
Last Updated Date: 06/27/2012

Almost every instrument at the NCNR and other neutron scattering facilities depends on 3 He proportional tubes because of their high efficiency, … more

X-Ray Standards
Last Updated Date: 06/26/2012

A new free-air ionization chamber has been built to eventually replace the Wyckoff-Attix chamber, which has been used at NIST as a primary x-ray … more

Spectrometry of X-Ray Beams Used for Calibrations
Last Updated Date: 06/26/2012

Spectrometry measurements in the x-ray calibration ranges have been undertaken using a high-resolution HPGe detector both in the direct beam and … more

Advancing Alanine Dosimetry for Small Radiosurgery Fields
Last Updated Date: 06/26/2012

Research is underway to expand the current range (20 Gy to 200 kGy) of alanine dosimetry to include therapy level dosimetry (as low as 1 Gy) for … more

International Comparisons for Air Kerma and Absorbed Dose to Water from Gamma-ray Beams
Last Updated Date: 06/26/2012

A bilateral comparison was conducted between NIST and the International Atomic Energy Agency (IAEA) to support international efforts for … more

Standard Reference Data on Radiation Interactions
Last Updated Date: 06/26/2012

NIST has nearly five decades of experience in the development of critically evaluated, comprehensive databases of cross-section information for … more

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