[ RadSafe ] Re: [Radsafe] Yucca Mountain - neptunium

[JPreisig at aol.com]

Hmmmmm,

       This is from:     jpreisig at aol.com    .


       Howdy radsafers,
       (And greetings to the new Radsafe Moderator ---  Many Thanks).


             Hi Franz,

                    I don't know much about specifics of the Yucca Mountain
             storage facility.  However, when I was doing groundwater 
modelling
             in New Jersey (USA) for a Low Level Radioactive Waste Facility, I
             found Kd values for the following radionuclides caused these 
             radionuclides to transport (in groundwater) at rates close to the
             groundwater itself:  Tritium, C-14, Tc-99, I-129 and Np-237.
             There may be other radionuclides that move at rates similar to 
that
             of groundwater---   I think I got the Kd values at the time from 
an
             EPA computer code Presto.

                    Kd values are described in the groundwater book by Freeze 
and
             Cherry and possibly in the book by de Marsily.  I don't recall 
New
             Jersey Low Level Radioactive Waste containing much Neptunium.
             "Official" Kd values can probably be found in the scientific 
literature,
             although I didn't have much access to the literature at that 
time.

                  Yucca Yucca Yucca........

                  Regards,                             Joseph R. (Joe) 
Preisig, Ph.D.