Radiation Physics Portal

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

The well-known interaction of low-energy neutrons and 3 He produces a proton and a triton with 764 keV of kinetic energy shared between the two … more

The purpose of the IEC 62755 standard N42 data format is to facilitate manufacturer-independent transfer of information from radiation measurement … more

Far-infrared (or THz, 25 to 300 micron wavelength) femtosecond laser methods are employed to measure photovoltaic (PV) materials spectra and … more

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

The U.S. Navy uses thermoluminescent dosimeters (TLDs) to monitor personnel for radiation exposure. more

The Neutron Interferometry and Optics Facility (NIOF) located in the NIST Center for Neutron Research Guide Hall is one of the world's premier … more

Three independent femtosecond laser systems used for generating ultrafast pulses in the mid-IR (and far infrared:THz) through the UV; infrared … more

The Medical-Industrial Radiation Facility (MIRF) located in the  Radiation Physics Division  of the NIST  Physical Measurement Laboratory is a … more

Radioactivity measurements for diagnostic and therapeutic nuclear medicine in the United States are based on measurements at NIST. Activity … more

Absolute irradiance calibrations based on the calculability of synchrotron radiation are performed on beamline 2. See GOES-R/EXIS and SDO as … more