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Physics Programs & Projects

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International Comparison of Tc-99
Last Updated Date: 03/19/2013

An international measurement comparison for a 99 Tc solution hosted by National Physical Laboratory (NPL) of the UK, (CCRI(II)K-2. 99 Tc … more

Comparison of Co60 Absorbed Dose for High-Dose Dosimetry
Last Updated Date: 03/13/2013

NIST participated in a recent international comparison of standards for absorbed dose to water for 60 Co gamma radiation at radiation-processing … more

Dose/Dose-Rate Effects in Alanine Dosimetry
Last Updated Date: 03/13/2013

Check standards are used by the NIST Ionizing Radiation Division to monitor the performance of the alanine dosimetry system that is central to its … more

Applications of NIST Alanine/EPR Dosimetry to the Irradiation of Blood and Blood Products
Last Updated Date: 03/13/2013

At present, irradiation of blood products with ionizing energy is the only procedure known to prevent transfusion-associated graft-versus-host … more

Advanced X-ray Systems for the Detection of Special Nuclear Materials
Last Updated Date: 03/13/2013

The Dosimetry Group provides support to the Domestic Nuclear Detection Office (DNDO) of the Department of Homeland Security (DHS) for their … more

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

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.

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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