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Act nowRadioactivity and You
| Type | Medium | Penetrative Power Limit by Example | Equivalent Dose (Sievert [Sv]) per 1 Gray (Gy) |
|---|---|---|---|
| Alpha α | Helium-4 nucleus | Paper | 20 Sv |
| Neutron | Water |
5 Sv (less than 10 keV) 10 Sv (10 keV to 100 keV) 20 Sv (100 keV to 2 MeV) 10 Sv (2 MeV to 20 MeV) 5 Sv (greater than 20 MeV) |
|
| Beta β | Electron/Positron | Sheet metal | 1 Sv |
| X-ray | Photon | Skeleton/Bone | 1 Sv |
| Gamma γ | Photon | Lead | 1 Sv |
Equivalent dose weighting factors, see:
https://ocw.mit.edu/courses/22-55j-principles-of-radiation-interactions-fall-2004/d80bba59cce4de9c4ea0ffd342051a6e_bakgrnd_radiaton.pdf