[1] United States Transuranium and Uranium Registries,
[2] Washington State University Tri-Cities,undefined
[3] Richland,undefined
[4] WA 99352,undefined
[5] USA,undefined
[6] MRC Radiation and Genome Stability Unit,undefined
[7] Harwell,undefined
[8] Oxfordshire OX11 0RD,undefined
[9] UK e-mail: h.nikjoo@har.mrc.ac.uk Tel.: +44 (1235) 834 393; Fax: +44 (1235) 834 776,undefined