An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
DESCRIPTION The Standard Reference Photometer (SRP) Program began in the early 1980s as collaboration between NIST and the U.S. Environmental Protection Agency
NIST's PV characterization laboratory is used to measure the electrical performance and opto-electronic properties of solar cells and modules. This facility
Piston gauges are used to calibrate customer piston gauges and pressure sensing devices. Piston gauges are calibrated via a direct comparison to another piston
Built with a collaboration with the RSoXS project in the NIST Materials Science and Engineering Division, polarized resonant soft X-ray scattering (P-RSoXS) is
Positron annihilation lifetime spectroscopy uses positrons to probe material defects/voids/free volume at the sub-nm scale. The general working principle is
Prompt gamma-ray activation analysis is a measurement technique for nondestructive elemental analysis. Samples are irradiated by a beam of neutrons inducing
Built in 2018, the PSCR Innovation Laboratory is focused on next-generation communication capabilities for first responders. The PSCR lab maintains a modernized
This apparatus, developed at EL, determines gasification rate (mass loss rate) of a horizontally oriented specimen exposed in a nitrogen environment to a
Radiochemical neutron activation analysis (RNAA) extends the capabilities of instrumental neutron activation analysis (INAA) by adding a chemical separation to
Radioactivity measurements for diagnostic and therapeutic nuclear medicine in the United States are based on measurements at NIST. Activity measurements for γ
The NIST-developed reference ballistic chronograph (RBC) provides repeatable measurements of the speed of a bullet that will impact a test article, such as
The reference integrating sphere performs directional-hemispherical reflectance measurements of spectrally neutral, non-fluorescent samples at room temperature
The Reference Transmission Densitometer (RTD) is the national reference instrument for standard diffuse visual transmittance density measurements for x-ray and
The Reference Transmittance Spectrophotometer (RTS) is the national reference instrument for regular spectral transmittance measurements of non-fluorescent