Element

Radionuclide

Source of radioactivity

Primordial or natural origin

Fallout from nuclear weapon tests

Low level liquid discharges and emissions to atmosphere from nuclear reprocessing plants

Low level liquid discharges and emissions to atmosphere from nuclear power stations

Medical and scientific research

Additional radionuclides likely to be emitted from a nuclear power station or reprocessing plant in the event of uncontrolled explosion or fire

³H

Yes

Yes

Yes

Yes

Yes

⁷Be

Yes

¹⁴C

Yes

Yes

Yes

Yes

Yes

³²K

Yes

Yes

³⁵S

Yes

Yes

⁴⁰K

Yes

⁴⁵Ca

Yes

⁵¹Cr

Yes

Yes

⁵⁴Mn

Yes

Yes

⁵⁵Fe

Yes

Yes

⁵⁹Fe

Yes

⁵⁸Co

Yes

⁶⁰Co

Yes

Yes

Yes

⁶³Ni

Yes

⁶⁵Zn

Yes

⁷⁶As

Yes

⁸⁵Kr

Yes

Yes

Yes

Yes

⁸⁹Sr

Yes

Yes

⁹⁰Sr

Yes

Yes

Yes

⁹¹Y

Yes

⁹⁵Zr

Yes

Yes

Yes

⁹⁵Nb

Yes

Yes

Yes

⁹⁵Tc

Yes

⁹⁹Tc

Yes

Yes

Yes

¹⁰³Ru

Yes

Yes

¹⁰⁶Ru

Yes

Yes

^110mAg

Yes

¹²⁴Sb

Yes

¹²⁵Sb

Yes

^125mTe

Yes

¹³²Te

Yes

¹²⁹I

Yes

Yes

Yes

¹³¹I

Yes

Yes

Yes

^131mXe

Yes

^133Xe

Yes

¹³⁴Cs

Yes

Yes

Yes

Yes

¹³⁶Cs

Yes

¹³⁷Cs

Yes

Yes

Yes

Yes

¹⁴⁰Ba

Yes

¹⁴⁰La

Yes

Yes

¹⁴¹Ce

Yes

Yes

¹⁴⁴Ce

Yes

Yes

Yes

¹⁴⁷Pm

Yes

¹⁴⁷Nd

Yes

Yes

¹⁵⁴Eu

Yes

¹⁵⁵Eu

Yes

²³²Th

Yes

²³⁵U

Yes

²³⁸U

Yes

²³⁷Np

Yes

Yes

Yes

²³⁸Pu

Yes

Yes

Yes

²³⁹Pu

Yes

Yes

Yes

²⁴⁰Pu

Yes

Yes

Yes

²⁴¹Pu

Yes

Yes

Yes

²⁴²Pu

Yes

²⁴¹Am

Yes

Yes

Yes

²⁴²Cm

Yes

Yes

²⁴³Cm

Yes

Yes

²⁴⁴Cm

Yes

Yes