Radioactivity, natural
 scroll 
Naturally occurring nuclides which are radioactive.
A distinction is drawn between natural radionuclides which are continuously
regenerated by nuclear reactions of cosmic radiation, cosmogenic radionuclides
(see 'radionuclides, cosmogenic')
and primordial (initial) radionuclides (see 'radionuclides,
primordial'), which have existed since the earth was formed and
due to their long half-life have not yet decayed and the radionuclides
generated from the primordial radionuclides U-238, U-235 and Th-232
of the associated decay chain.
Nuclide |
Aktivity in Bq |
H-3 |
25 |
Be-7 |
25
|
C-14 |
3,800 |
K-40 |
4,200 |
Rb-87 |
650 |
U-238, Th-234, Pa-234m, U-234 |
4 |
Th-230 |
0.4 |
Ra-226 |
1 |
short-lived Rn-222 decay products |
15 |
Pb-210, Bi-210, Po-210 |
60 |
Th-232 |
0.1 |
Ra-228, Ac-228, Th-228, Ra-224 |
1.5 |
short-lived Rn-220 decay products |
30 |
Natural radioactive substances in the
human body
back
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ENS conferences |
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TopSafe 2017
12-16 Feb. 2017
Vienna, Austria |
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PIME 2017
19 - 22 March 2017, Middelburg Netherlands |
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RRFM 2017
14 - 18 May 2017 in Rotterdam, Netherlands |
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ETRAP 2017
30 May - 2 June 2017, Valencia, Spain |
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