As part of the preparation and calibration of three new National Institute of Standards and
Technology (NIST) tritiated-water radioactivity Standard Reference Materials (SRMs), we have …

The half-lives of many radionuclides have been measured in the Radioactivity Group of
NIST over the last three decades. The results of these measurements for many long-lived …

For nearly half a century, the half-lives of many radionuclides have been measured with
increasing precision. The results of these measurements for many long-lived radionuclides, …

As reported at the ICRM 2011, it was discovered that the source holder used for calibrations
in the NIST 4πγ ionization chamber (IC) was not stable. This has affected a large number of …

Massic activity values obtained for NBS/NIST tritiated water SRMs 4927 and 4927E, using
internal gas-proportional counting, are reported. The massic activity ratios of all of the …

Radionuclides are increasingly used in therapeutic nuclear medicine. The CIEMAT/NIST
method of standardizing high-energy beta-particle emitters is being applied to a list of …

MATERIALSAND METHODS All solutions of †88Re (as †88ReO4) were prepared at
NIST (except as noted) from saline elutions of a †88WP88Regenerator (11) that was …

This paper presents an overview of the primary calibration of radioactive gas standards using
length-compensated internal gas counters. The principle of length compensation and the …

Solutions containing the potential radiotherapy radionuclide 177 Lu have been standardized
at the National Institute of Standards and Technology (NIST) by 4πβ liquid scintillation (LS) …

Method 1a began with a simple peak integration over a linear baseline, using the same
boundary windows for peak and baseline for all spectra in a series. 7 Times, net peak areas, and …