| This symbol is included in ISO 21482:2007 | - Contains tabulated information on radioactive decay types and energies |
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| Radio-activity by Ernest Rutherford Phd, Encyclopedia Brit | This symbol is included in ISO 21482:2007 |
| ISO has not reviewed the accuracy or veracity of this information | - Contains tabulated information on radioactive decay types and energies |
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| Piraux ,les Radio -isotopes et leur applications industrielles Dunod ,1963 |