And David, have you never heard of Wikipedia? Just look up 'beta radiation'.
Where you see in wikipedia how much eV have beta radiation?
http://en.wikipedia.org/wiki/Beta_particleedit: What is photon mass. It's like kinetic energy of say neutron is mv. And full energy is mvc^2. So photon mass should be E/c^2, isn't? Becouse light also have small presure. Visible light photon energy is about 40-50 eV. 1eV=1.6/10^19 J. Thus photon of ~400 nm mass is (40*1.6/10^19)/(9*10^16)=7.1/10^35 kg. Or photon kinetic energy is 40*9/10^16=3.6/10^14 eV. Thus even gamma rays of 10 MeV kinetic energy is 9*10^6 /10^16=9/10^10 eV=900 peV. Even cousal radiation of electrons with probably few eV (I read that there was ideas to use radioactive beta radiation of some materials for year or mounts notebooks batteries) have bigger kinetic energy than gamma rays. But how gamma rays can be absorbed? Maybe they are reflected? Like we know can absorbed in atoms only somthing about visible light photons and ultraviolet maybe. How gamma rays can actualy be absorbed? Which theories predicting it? Or Why X-rays cousing desies (they production is electrons rapid deacelerations into wall). Maybe X-rays not kill people in XIX-XX century begining, but beta radiation of electrons, which reflect?