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Physics Programs & Projects

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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

Enhanced X-Ray Imaging
Last Updated Date: 02/26/2013

This project pursues enhanced x-ray image acquisition and analysis methods that are applicable to, for example, security and medical applications … more

High-Resolution X-ray Spectroscopy
Last Updated Date: 02/26/2013

We are pursuing a program of x-ray spectroscopy of highly-charged ions and plasmas using custom-designed and constructed curved crystal … more

Remote Sensing Methods for Imaging Dose to Water
Last Updated Date: 02/26/2013

Calorimetry based upon remote sensing of the temperature field in an irradiated volume would offer distinct advantages over the present approach, … more

Photon and Charged Particle Data Center
Last Updated Date: 02/26/2013

The Photon and Charged Particle Data Center has long been an international source of photon and charged particle reference data that have been … more

Traceability for Industrial Irradiator
Last Updated Date: 02/26/2013

U.S. manufacturers have contended for decades that traceability to national standards for industrial irradiation applications is best achieved by … more

Surface Plasmon Resonance Imaging of Cells and Extracellular Matrix Proteins
Last Updated Date: 10/10/2012

A critical challenge in cell biology is imaging and quantifying the interactions of cells with their extracellular matrix (ECM) environment, and … more

Chemical/Biochemical Microsensor Science
Last Updated Date: 10/02/2012

The Process Sensing Group at NIST is investigating a range of fundamental and technological issues related to next-generation chemical and … more

Spectral responsivity measurement
Last Updated Date: 10/02/2012

NIST provides calibration of the spectral responsivity and spatial uniformity of photodetectors for use in industrial and government labs. These … more

Energy Determination of X-Ray Transition Energies Using the NIST TES Microcalorimeter Detector
Last Updated Date: 10/02/2012

Previous efforts to produce a comprehensive tabulation of atomic x-ray transition energies have been hampered by the fact that a) detectors having … more

Molecular Orbital Structure of Energetic Nitrogen Compounds from X-Ray Emission Spectroscopy
Last Updated Date: 10/02/2012

When chemical compounds of low-Z elements are excited by x-rays, the ionized core states are filled from the valence band. The molecular orbital … more

Inkjet Gravimetry
Last Updated Date: 10/02/2012

Gravimetric and optical methods were developed to assure quantitative deposition of compounds from nano-dispense devices onto the surfaces of … more

Spectroscopic Measurements of Atmospheric Gases for Monitoring Greenhouse Gases
Last Updated Date: 10/01/2012

Climate scientists are developing a new generation of spectrometers for the NASA-sponsored inventory of atmospheric greenhouse gases, most notably … more

Dosimetry Standardization for Radiobiology
Last Updated Date: 08/21/2012

A program for the development of dosimetry standards for radiobiology was launched through a highly successful workshop.  The … 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. 

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