The chemical element krypton, whose principal source is the atmosphere, had a long-lived radioactive content, in the mid-1940s, of less than 5 dpm per liter of krypton. In the late 1940s, this content had risen to values in the range of 100 dpm per liter. It is now some hundred times higher than the late 1940 values. This radioactivity is the result of the dissolving of nuclear fuel for militar...

The yields and velocity distributions of heavy residues and fission fragments from the reaction of 20 MeV/nucleon 197 Au + 90 Zr have been measured using the MSU A1200 fragment separator. A bimodal distribution of residues is observed, with one group, resulting from peripheral collisions, having fragment mass numbers A=160– 200 while the other group, resulting from " hard " collisions, has A=12...

In this paper, a novel approach where irradiated fuel thermochemistry and gas release are coupled is presented in details illustrated by the simulations of some tests VERCORS program characterized increasing temperatures varying composition furnace (oxidizing or reducing conditions). At each step tests, oxidation/reduction nuclear fission product chemical speciation precisely assessed thanks to...

The primary photodissociation dynamics of allyl chloride upon excitation at 193 nm is investigated in a crossed laser-molecular beam scattering apparatus. Tunable vacuum ultraviolet ~VUV! photoionization of the products provides a unique ability to learn about the secondary reaction products of the nascent photoproducts formed. The data show evidence for four significant primary reaction channe...