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Chemistry Programs & Projects

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National and International Standards for X-ray Security Screening Applications
Last Updated Date: 03/13/2013

The primary objective of this project is to assure the technical performance and radiation safety of the nation’s x-ray and gamma-ray security … 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

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

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

National Air-Kerma Standard for Electronic Brachytherapy
Last Updated Date: 03/13/2013

The Dosimetry Group has developed a new facility for the calibration of the Xoft miniature x-ray source, which provides low-energy x-rays (< 50 … more

Illicit Trafficking of Radioactive Materials
Last Updated Date: 03/13/2013

The National Institute of Standard and Technology (NIST) is working in the development of ANSI/IEEE and IEC standard for the detection of illicit … more

Springback
Last Updated Date: 03/13/2013

Elastic springback compensation is a long-standing issue for formed sheet automotive components.  The ability to predict the magnitude of … 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

International Comparison of Lu-177
Last Updated Date: 03/05/2013

There has been increasing interest during the past 10 years in the use of 177 Lu for radionuclide-based radiotherapy for certain types of cancers. … 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

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

Theoretical Dosimetry and Radiation-Transport Calculations
Last Updated Date: 02/27/2013

The fundamental photon and charged particle interaction data and the radiation transport methods, pioneered and developed at NIST to calculate the … more

Calibration of Low-Energy Photon Brachytherapy Sources
Last Updated Date: 02/27/2013

Small radioactive "seed" sources used in prostate brachytherapy, containing the radionuclide 103 Pd, 125 I, or 131 Cs, are calibrated in terms of … more

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