The tritium content of U.S. National Bureau of Standards tritiated water Standard Reference Materials SRM-4926, -4926C and -4927B have been measured by mass spectrometry, where the accumulation of 3He from tritium decay is measured as a function of time. The averaged results, which are compared with other independent calibrations, are 0.7% higher than the NBS certified values and have an uncert...

A number of palladium alloys have been loaded with deuterium or hydrogen under low energy plasma bombardment in a system that allows the continuous measurement of tritium. Long run times (up to 200 h) result in an integration of the tritium and this, coupled with the high intrinsic sensitivity of the system (~ 0.1nCi/l), enables the significance of the tritium measurement to be many sigma (>10)...

The thermal cycling absorption process (TCAP) is a semi-continuous chromatographic process for hydrogen isotope separation developed at the Savannah River Technology Center (SRTC) of the Savannah River Site (SRS) to support the tritium production and recycling operations for the national defense program. Hydrogen has three isotopes—protium, deuterium, and tritium. Among these, protium is known ...

Savannah River Tritium Enterprise has used LaNi4.25Al0.75 (LANA75) hydride beds to store hydrogen isotopes for over two decades. A benefit of using LANA75 is that the 3He generated from tritium dec...

Highlights are presented of recent results obtained on deuterium and hydrogen loading of palladium both in electrolytes and in the gas phase. Reproducible tritium generation has been found on palladium cathodes with deuterium loadings approaching one deuterium atom per palladium atom. Tritium generation has been observed on four out of four such highly loaded cathodes. No tritium has been obser...

Measurement of the effects of helium (from tritium decay) on the weldability of Types 304 and ITER Grade 316LN stainless steel demonstrated the inherent complexities in designing and conducting an experimental program using tritium-charged-and-aged materials to simulate the effects of irradiation-induced helium on weld behavior. Differences in microstructure, surface condition and alloy chemist...

On 2 May 1974, 479,000 Ci of tritium gas escaped from a Savannah River Plant exhaust stack. The tritium first reached the ground in a pine forested area and was partially assimilated into the ecosystem. Samples of vegetation collected and measured for a period of 70 days showed an increase in the levels of tritiated water. Cycling of the tritium retained in the forest ecosystem resulted in a hi...

Internal dosimetry models that currently drive regulatory compliance decisions assume that tritium retention kinetic behavior can be modeled by a single exponential function. This is contrary to the results of a number of modeling techniques, which indicate that while elemental tritium (HT) and tritiated water (HTO) are the most commonly released forms of tritium, organically-bound tritium (OBT...

An enzyme fraction from the green alga Chlorella pyrenoidosa that catalyzes the reversible epimerization of guanosine B’diphosphate D-mannose to guanosine 5’-diphosphate L-galactose brings about the incorporation of tritium from tritium-labeled water into the hexosyl moieties of those sugar nucleotides. The hexoses were degraded by periodate oxidation whereby the tritium was found to be equally...