# Ionizing radiation energy in joules

The energy level at which radiation can be labelled as ionizing is about $$10.00-33.85$$ eV. This (the $$33.85$$ eV) is equivalent to $$5.423368\cdot 10^{-18}$$ Joules. In terms of joules this is a very low energy. How is this ionizing? Is this the energy of a single electron in the radiation, or then how many electrons are there?

• Where did you get that data? It doesn't seem correct. And what type of radiation are you talking about? Commented Apr 3, 2022 at 23:23
• Yes, it isn’t many Joules. Which is why atomic physics tends towards using electron Volts. It takes 13.6 eV to remove the electron from a hydrogen atom. And an energetic, liberated electron can cause mor damage elsewhere, disrupting further bonds in biologically important molecules. Commented Apr 4, 2022 at 0:32
• @josephh " The energy of ionizing radiation starts between 10 electronvolts (eV) and 33 eV and extends further up" from wikipedia page on ionizing radiation. to convert from eV to Joules the conversion factor is 1.6022e-19. of course 33eV is the minimum energy of ionizing radiation. the one used in radiation treatment reaches MeV but even so like the 25MeV radiation is only equivalent to 4.005441412e-12 joules. Commented Apr 8, 2022 at 23:40