-16Table III.
(1)
List of Radionuclides
Fissionproducts of direct biomedical interest.
$r90(28 y) chemically like Ca, daughter of 33 sec kr90
Cs137(30 y) chemically like K, weak gamma
(2)
os Sears
a gproucts
,
(half lives about 2 months), used to indicate age of
STaebris tnd fractionation effects due to chemistry, solubility or
gaseous precursors; zr95 can be detected by gamma spectroscopy.
Bal40 (12.8d) used to indicate very fresh debris
Cel41, cel44, a pair of beta-gamma emitters of 1 and 10 months half
life, used for age and fractionation determination.
(3)
Other artificial activities
Rh10Z (210 4)
amc
wi85 (74 d) associated with Hardtack series.
(4)
(5)
Cosmic-ray and bomb produced activities
H (tritium) (12.5 y), used in studying H20 cycle
c14 (5700 y) used in studying COgcycle, global transport
Natural terrestrial activities
Rn222 and Pb210 (RaD), 3.8 d gas and its 19.4 y solid daughter for
studying micrometeorology, air masses, global exchange, scavenging.
DOE ARCHIVES
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