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Physics Programs & Projects

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Comparison of ANSI N42.46 and IEC 62523 Standards for Cargo and Vehicle Screening
Last Updated Date: 03/13/2013

We are undertaking a comparison of the relative performance of ANSI N42.46 and IEC 62523 consensus standards for x-ray cargo and vehicle screening. more

Air Kerma Measurements in High Energy X-ray Beams
Last Updated Date: 03/13/2013

Cargo-inspection systems employ high-energy x-ray beams from accelerators. These systems are designed to detect potential threats that may be … more

Key Comparison for Air-Kerma From Therapy Level and Radiation Protection Gamma-Ray Beams
Last Updated Date: 03/13/2013

Comparisons for the national standards of air kerma from therapy level and radiation protection gamma-ray beams were conducted by the NIST and the … more

Electron and Proton Absorbed-Dose-to-Water Primary Standards
Last Updated Date: 03/13/2013

Work on absorbed-dose standards for particle beams is in progress, with preliminary results obtained for both high-energy electrons (at the NIST … more

Small-Field Therapy Dosimetry Using Alanine/EPR
Last Updated Date: 03/13/2013

NIST has an ongoing program in small-field therapy dosimetry studies using alanine/EPR.

Absorbed Dose to Water and Air Kerma Calibrations in Co-60 Therapy Level Gamma-Ray Beams
Last Updated Date: 03/13/2013

Three dosimetry calibration laboratories accredited by the American Association of Physicists in Medicine (AAPM) routinely perform calibrations of … more

Development of a New 137Cs Gamma-Ray Calibration Facility
Last Updated Date: 03/13/2013

The construction of a new primary calibration facility for air kerma measurements has been completed. It delivers a collimated 137 Cs gamma-ray … more

Air Kerma Calibrations in Radiation Protection Level 137Cs and 60Co Gamma Ray Beams
Last Updated Date: 03/13/2013

The Dosimetry Group maintains and disseminates the national measurement standards for air-kerma (exposure) from 137 Cs and 60 Co gamma-ray beams   … more

Ba-133 Standard
Last Updated Date: 03/11/2013

The International Atomic Energy Agency (IAEA) recently initiated a Cooperative Research Project  (CRP) entitled “Development of Quantitative … more

Automated Multi-Sample Ionization Chamber for Radioactivity Standards
Last Updated Date: 03/11/2013

NIST radioactivity standards for gamma-ray emitting radionuclides are maintained as calibration factors for an automated ionization chamber.

Photon Absorbed-Dose-to-Water Primary Standards
Last Updated Date: 03/08/2013

Computational and experimental studies to obtain correction factors for heat defect, heat transfer and scattering/perturbation for the water … more

Standards for Clinical Radionuclide Calibrators
Last Updated Date: 03/05/2013

In nuclear medicine clinics, activity measurements are typically made using commercially available radionuclide calibrators which incorporate a … more

Micelle Effects in Liquid Scintillation Counting
Last Updated Date: 03/04/2013

Commercially available scintillates (often referred to by manufacturers as “cocktails”) for liquid scintillation (LS) counting are complex … more

A Study of the Irradiation-Temperature Coefficient for Alanine Film and Pellet Dosimeters at Elevated Temperature
Last Updated Date: 03/01/2013

Correcting the response of a dosimeter for the average temperature during irradiation processing improves the accuracy of the dose measurement.  more

High-Dose Dosimetry
Last Updated Date: 03/01/2013

The activities described here support the application of high-dose, high-energy ionizing radiation for a variety of industrial processes. … more

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