[ RadSafe ] Guidelines for uranium and thorium in water?

parthasarathy k s ksparth at yahoo.co.uk
Mon Jun 19 23:47:25 CDT 2006

Dear Radsafers,
You may recall that the WHO goes on changing its guidelines on uranium in drinking water. Every time they state that the values recommended are provisional! But the numbers proposed vary so much that it may be difficult to use them in any rational discussion with the public.(2 ppb to 30 ppb!)
Finally, WHO also states that the final number has to be decided by the national regulatory authority.
Any comments from specialists on NORM
K.S.Parthasarathy Ph.D
(formerly, Secretary, Atomic Energy Regulatory Board)
Raja Ramanna Fellow
Strategic Planning Group,
Board of Research in Nuclear Sciences
Department of Atomic Energy
Room No 18
Ground Floor, North Wing
Vikram Sarabhai Bhavan
Mumbai 400094
E-mail ksparth at yahoo.co.uk
91+22 25555327 (O)
91+22 25486081 (O)
91+22 27706048 (R)
9869016206 (mobile)

----- Original Message ----
From: franz.schoenhofer at chello.at
To: radsafe at radlab.nl
Sent: Friday, 9 June, 2006 8:04:31 PM
Subject: [ RadSafe ] C h e m o t o x i c i t y of thorium?


I stay now for a few months in Poland, working on a project on NORM in drinking water. Because of numerous discussions inspired by the fact that the European Union set only a radiation specific limit for radionuclides including "uranium", though uranium is far more chemotoxic than radiotoxic I wonder, how the situation is with thorium. I have not found anything useful about chemotoxicity of thorium in comparison of its (high) radiotoxicity.
Any information, any links available?

Best regards,


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