1 23 Journal of Radioanalytical and Nuclear Chemistry An International Journal Dealing with All Aspects and Applications of Nuclear Chemistry ISSN 0236-5731 Volume 288 Number 2 J Radioanal Nucl Chem (2011) 288:443-445 DOI 10.1007/ s10967-010-0941-6 Direct dissolution of UO2 and in situ extraction by TBP–HNO3 and TiAP– HNO3 organic solutions at atmospheric pressure