Removing tritium produced by D-D fusion and recycling part of it after it decays to He-3 significantly reduces the fraction of fusion energy carried by neutrons in a D-D system. For a catalyzed D-D system (no tritium removal), the peak dpa rate in candidate structural materials is 25-35% lower than that in an equivalent D-T system with the same fusion power wall loading. The gas production and ...

In this paper the problem of tritium transport in PbLi (Lead-Lithium) blankets has been studied and analyzed by means of our recently developed computational models. Several simulations are performed by incorporating the geometric configurations of the PbLi blankets including both DCLL (Dual Coolant Lead Lithium) and HCLL (Helium Cooled Lead Lithium) blankets. Tritium permeation loss percentage...

The release of crude tritium gas from neutron-irradiated LiAI alloy, and the following purification and the trapping of the gas have been preliminary studied to obtain information necessary for the development of tritium technology. The percentages of the fractions of H2(T) and H20(T) occupying about 99% among gaseous species(T) released were largely influenced by pre-irradiation treatment of t...

Numerical simulation of tritium permeation from breeding zones to the coolant in the helium cooled pebble-bed blanket is performed in this paper. 2D and 3D convection–diffusion models are developed to account for the effects of purge stream convection. Incompressible transient Brinkman model with variable permeability is used in flow calculation, and transient diffusion and convection equations...

When dl-1 ,2-propanediol-l-3H is converted to propionaldehyde in the presence of dioldehydrase and cobamide coenzyme, tritium is transferred to the coenzyme. The tritiated coenzyme so obtained transfers tritium to the reaction product when reacted with dl-1,2-propanediol and apoenzyme. The coenzyme is tritiated exclusively at the C-5’ position of the adenosyl moiety. The location of tritium was...

The large amounts of tritium produced at the Savannah River Site (SRS) coupled with the current dose reconstruction study at the facility emphasize the importance of ensuring accurate and efficient prediction of tritium doses to the public. Presently, dose estimates to the general population in the site vicinity are calculated annually using a five year meteorological database. Determining whet...

Faecal tritium excretion after intravenous 3H-25-hydroxyvitamin D3 administration was measured in three control subjects and in six patients with small intestine resection or bypass. The mean daily faecal tritium excretion over four to six days ranged from 0.8-1.6% of the injected dose in the controls (mean 1.2) and 0.9-6.8% in the patients (mean 3.7). There was a significant positive correlati...

and petiole, the interveinal tissue did not reach tritium equality with major veins, the stem, or the external solution. Water of the interveinal tissue maintained a stable tritium content at 60 to 70 % of external concentration for long periods. The pattern of results obtained was similar in sunflower and tobacco. Tritium content of leaf-tissue water vapor transpired by the canopy of an intact...

The tritium atom of deoxyuridylate-5-3H is obligatorily displaced in the thymidylate synthetase reaction and equilibrates with water. Accordingly, a new and simple assay for the enzyme has been devised which is based on the measurement of the tritium released. This method shows essentially the same substrate requirements and pH optimum as the spectrophotometric assay. It has the advantage of mu...