[ RadSafe ] Question about danger of Uranyl Nitrate solution

[Felipe Gaitan]

Dear Radsafers,

I am reviewing a paper in which they irradiate with ultrasound a 
solution containing 7 g of Uranyl Nitrate (UN, 99.3% U-238) dissolved 
in a mixture of Acetone (14%), Benzene (43%), and Tetrachloroethylene 
(43%).  Percentages are by volume. According to the paper, UN is only 
soluble in Acetone so they prepared this solution first before adding 
the Benzene and the Tetrachloroethylene.  UN is used as a source of 
alpha particles.

My question is, how dangerous is this solution if the vapors were 
inhaled and/or absorbed through the skin?

Thanks in advance,

Felipe