[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Natural Thorium
Dear Radsafers,
Here is the quote from IAEA Basic Safety Standards (Safety Series 155-I)
which are specifying the exemption levels for "U-nat" and "Th-nat" in Table
I-I (1 Bq/g for both).
The footnote to the Table I-I says:
"Parent nuclides and their progeny included in secular equilibrium are
listed in the following:
.................
Th-nat: Ra-228, Ac-228, Th-228, Ra-224, Rn-220, Po-216, Pb-212, Bi-212,
Tl-208 (0.36), Po-212 (0.64)
.................
U-nat: Th-234, Pa-234m, U-234, Th-230, Ra-226, Rn-222, Po-218, Pb-214,
Bi-214, Po-214, Pb-210, Bi-210, Po-210
................."
Kind regards
Nick Tsurikov
Eneabba, Western Australia
ntsuriko@rgc.com.au
World Collection of Radiation Links:
http://www.westnet.net.au/Walkabout/
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html