8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Tue 611:23-14:00P2.7The field experiments on the HTO washout from theatmosphereYuri Balashov, 1 Alexey Golubev, 1 Sergey Mavrin, 1 and Valentina Golubeva 11 VNIIEF, Mira 37, 607190, Sarov, Russian FederationThe results of the field experiments of HTO washout with rainfall in the vicinity of the HT andHTO emission source are presented. The objective of the current study was to obtain the directexperimental data on the impact of raindrops characteristics (rate and spectrum of the drops) onHTO washout from the atmosphere. The site of the scavenging experiments was around a 30 memission source. The experimental site was a relatively flat one (the maximal height variationswithin the site were ± 5 m ) covered with single buildings and individual trees whose height wasfrom 10 to 30 m. The sampling arcs were chosen at 150 m from the base of the source to minimizedry deposition on the precipitation collectors. To study dependence of scavenging of tritium onraindrops characteristics, a laser optical device was constructed and used to measure the distributionof the drop radius and velocities during the period of experiment. The following parameterswere measured in every experiment: temperature and air humidity; HT and HTO activity in a stackgases; rain event parameters, including rain intensity, raindrop’s size and falling down velocity;HTO activity in rainwater samples, activity of volatile tritiated organics in water samples. Theresults are applied in (Golubev et al., 2011; Piskunov, 2011) for the development and validation ofvarious models of washout. References Golubev A. V., Piskunov V. N., Mavrin S. V., GolubevaV. N., Balashov Y. S., Aleynekov A. Y., Kovalenko V. P., Solomatin I. I., 2011. The effect of raincharacteristics on tritium oxide washout rate of atmosphere. LMC8 2011 abstract, September 6-10, Wien, Austria. Piskunov V. N. Rate determination for precipitation scavenging of HTO vapour.LMC8 2011 abstract, September 6-10, Wien, Austria7