NDLI: Effect of UV radiation on the behavior of CsI radioaerosols in the gas phase

Content Provider	Springer Nature Link
Author	Kulemin, V. V. Rumer, I. A. Bogachev, E. N. Mikheev, N. B. Kulyukhin, S. A.
Copyright Year	2007
Abstract	$^{137}$Cs$^{131}$I radioactive aerosols formed upon evaporating CsI from a Pt support to an Ar atmosphere or air under UV irradiation or without it are studied. Without UV radiation, the degree of localization of the aerosols in a bubbler filled with aqueous Na$_{2}$S$_{2}$O$_{3}$ varies from 30% in argon to 60% in air. In sublimation of $^{137}$Cs$^{131}$I from the Pt heater, a considerable amount of nanoparticles is formed, which are not absorbed by the aqueous solution in the bubbler and are even capable of penetrating through a combined filter fabricated from a Petryanov filter and a “White Ribbon” paper filter. In the Ar atmosphere, the conversion of CsI is minimal, being initiated by traces of oxygen and moisture, as demonstrated by data on the Cs/I ratio in various fractions. In both Ar and air, UV radiation increases the localization of the radionuclides in the bubblers, simultaneously decreasing practically by half the amount of $^{137}$Cs penetrating across the combined filter. Evidently, this is due to the fact that photoactivation promotes coarsening of nanoparticles through self-agglomeration or interaction with some coarser aggregates. A conclusion is made that UV radiation affects essentially the kinetics of aggregation of the aerosols in the gas phase, but not the rate of the chemical reactions occurring in the gas phase with participation of the aerosols.
Ending Page	91
Page Count	6
Starting Page	86
File Format	PDF
ISSN	10663622
e-ISSN	16083288
Journal	Radiochemistry
Issue Number	1
Volume Number	49
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2007-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chemistry/Food Science Nuclear Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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