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Radioactivity, natural

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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

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