U.S. flag

An official website of the United States government

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.

Physical Measurement Laboratory / Radiation Physics Division

Radioactivity Group

Projects/Programs

Displaying 26 - 40 of 40

Documentary Standards: IEC 62755 Standard N42 Data Format

Ongoing
The IEC 62755 standard specifies the XML data format that shall be used for both required and optional data to be made available by radiation measurement instruments. The performance requirements for these types of instruments are described in other IEC standards. The output from these instruments
standards for the detection of illicit trafficking of radioactive materials

Documentary Standards: Radiation Detection Documentary Standards Program

Ongoing
NIST leads and participates in the development and revision of documentary ANSI/IEEE (ANSI N42 standards currently transitioning to IEEE IMS TC 45 committee) and IEC (TC 45 WG B15 committee) standards that provide requirements and test methods for instruments used for the detection of illicit
NRIP illustration

Environmental: NIST Radiochemistry Intercomparison Program (NRIP)

Ongoing
The NRIP includes five matrices (acidified water, air filters, soil, synthetic urine and synthetic feces) of test samples spiked with a well-characterized solution that contains alpha-, beta-, and gamma-emitting radionuclides (see Table 1). The NRIP participants decide which radionuclides they will
Figure with the word “isotope” and related icons superimposed on a photograph of a man pointing to the figure.

Isotope Metrology

Ongoing
The application of isotope measurements drives advances in an enormous number of fields and stakeholder engagements, including federal and state government agencies, academia, and private industry including the medical industry. The objective of the NIST Isotope Metrology Program is to address the
dose calibrators

Medical: Standards for Clinical Radionuclide Calibrators

Ongoing
In nuclear medicine, clinical activity measurements are typically made using commercially available radionuclide calibrators (also referred to as “dose calibrators”) which incorporate a reentrant 4π ionization chamber and an electrometer. The current measured by these calibrators is translated into
nuclear forensics reference material program icons

Security: Nuclear Forensics Reference Material (RM) Program

Ongoing
NIST coordinates the production and characterization of nuclear forensics reference materials (NFRMs), which are vital for making precise and accurate measurements of nuclear materials. These materials will help ensure that measurements of nuclear material evidence are highly reliable, are traceable

Standard Reference Materials: Standardization of 232U (SRM 4324c)

Ongoing
The certified massic activity for 232U was obtained by 4παβ LS spectrometry with two commercial LS counters. The beta detection efficiencies for the 232U daughters were calculated using the MICELLE2 code for the CIEMAT/NIST efficiency tracing (CNET) method with composition-matched LS cocktails of a

Standard Reference Materials: Standardization of 243Am (SRM 4332f)

Ongoing
The certified massic activity for 243Am was obtained by 4παβ LS spectrometry with two commercial LS counters. The beta detection efficiencies for the 243Am daughter ( 239Np) were calculated using the CN2003 code for the CIEMAT/NIST efficiency tracing (CNET) method with composition-matched LS