DIFFUSION OF STRONTIUM THROUGH A PAPER IN SUPERCRITICAL CARBON DIOXIDE MEDIUM

摘要

Fundamental possibility of using supercritical and liquid carbon dioxide (SC-CO_2 and L-CO_2, respectively) for treating mail for purpose of detection of radioactive substance to prevent terrorist acts was shown. Diffusion of ~(90)Sr through layers of writing paper in the form of adducts of strontium di-2-ethylhexyl phosphates, di-octylfluoroamyl phosphates and perflorovalerianates with dicyclohexyl-18 crown-6 (DCH18C6) and polyethylene glycol 600 under the conditions of absence of ligand excess was studied. Coefficients of diffusion of ~(90)Sr complexes understudy were calculated. Coefficient of diffusion of strontium di-2-ethylhexyl phosphate through layers of a writing paper in medium of SC CO_2 was found to be equal to 7.7*10~(-4) mm~2/min. For adducts of ~(90)Sr perflorovalerianate and Sr~(90) di-2-ethylhexyl phosphate with DCH18C6 coefficients of diffusion amounted to 3.3*10~(-2) mm~2/min, and 2.43*10~(-2) mm~2/min, respectively.