Krypton-85 enters ground water by equilibration of the infiltration water with air in the unsaturated zone, assumed to have a 85 Kr activity similar to that of the atmosphere. If the effects of hydrodynamic dispersion are small, the 85 Kr specific activity of groundwater defines the time since the infiltration water was isolated from the atmosphere.
85Kr is a radioactive isotope of the noble gas krypton. It isproduced naturally, as well as by human activities, mainly the nuclearindustry. Due to its chemical stability as a noble gas, it is an idealtracer of environmental processes.
The krypton-85 specific activity in five groundwater samples ranged from 44.9 to 9.5 dpm cm-3 corresponding to groundwater ages of 2-17 years with a monotonic decrease in specific activity (increase in age) along the groundwater flow path.
Kr-85 Pressurization Tank Low leak rate sensitivity is based on the time of exposure and external tank pressure. The equation used to relate the gamma count rate to the leak rate can be found in Military Standard 883, method 1014 and Military Standard 750, method 1071.
Krypton 85: a Review of the Literature and an Analysis of …
Krypton-85 – Wikipedia, Krypton 85: a Review of the Literature and an Analysis of …
Krypton 85: a Review of the Literature and an Analysis of …
5/21/2009 · The activity of Kr 85 in the polycarbonate increases monotonously to the maximum reachable activity (A max). From practical point of view this means that for a given plate thickness exposure times greater than the corresponding time for reaching A max will not improve the performance of.
S = Specific activity (uCi/atm cc) K = counting efficiency (cpm/uCi) P = (P e2 – P i2) P e2 = external bomb pressure (atm) P i2 = internal pressure of device (atm) T = Bomb time (hours) t = 3600 (sec/hr.) (S)(K)(T)(P)(t) R Q S = The Krypton–85 equation is defined as: TM ogtkeGGTkngoketeo irosscom, 2/22/2015 · Activity could be given in terms of activity per volume of atmosphere, or mass of air, so one would consider the activity from the mass of the Kr-85, but then divide by the mass or volume of the combined air+Kr gas.
