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Radiation

SOCIAL SPOTLIGHT: RADIOMETRIC DATING

Dating can be complicated. Our team uses this instrument — a live-timed anticoincidence counter — to figure the decay rate of an isotope, which we can then use to determine an object’s age in the geological history of our planet (through a process called radiometric dating). Encased in 6,350 kg (14,000 lbs.) of lead blocks to shield from external radiation, its two levels of detection make this one of the most precise instruments for radioactivity measurements at NIST. Right now, our team is preparing to better measure the decay of iodine-129, which could expand dating capabilities beyond carbon’s 50,000 years to 160,000,000 years. That’s a lot of history we’ll be able to account for.

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R. Wilson/NIST

News and Updates

The Shape in Water

Tinkering with a method they helped develop over the last few years, scientists have for the first time used it to measure at the nanometer scale the

Projects and Programs

Gamma-ray Spectrometry System

NIST is equipped with a high resolution gamma-ray spectrometry system used for activity and impurity measurements of gamma-ray emitting sources used for nuclear

Publications

The Next Generation of Current Measurement for Ionization Chambers

Author(s)
Ryan P. Fitzgerald, Denis E. Bergeron, Dean G. Jarrett, Neil M. Zimmerman, Carine Michotte, Hansjoerg Scherer, Stephen Giblin, Steven Judge
Re-entrant ionization chambers (ICs) are essential to radionuclide metrology and nuclear medicine for maintaining standards and measuring half-lives. Metrology

Non-fuel Antineutrino Contributions in the High Flux Isotope Reactor

Author(s)
PROSPECT COLLABORATION, Jerome J. LaRosa, Hans P. Mumm, Svetlana Nour, Mark A. Tyra, Denis E. Bergeron
Reactor neutrino experiments have seen major improvements in precision in recent years. With the experimental uncertainties starting to surpass those from

Tools and Instruments

Neutron Imaging Facility (NIF)

Neutron Imaging, an Essential Tool for the Hydrogen Economy The problem that the NIST Neutron Imaging Facility (NIF) can address that directly impacts the

Cabinet x-ray system

The Smiths Detection 6046si cabinet x-ray system was designed for security screening of bags, parcels and other objects of similar size. The system runs at 160

Awards