What does light (electromagnetism) have to do with radioactivity?

READ this: http://en.wikipedia.org/wiki/Electroweak_force

Under high energy the two forces become the same force. The weak force is not radioactivity, it is only the cause of certain kinds of particle decay. The forces are united under a symmetry group.

Answer me this: When there was electroweak unification for matter how did this force act? What is the electroweak interaction?

Electroweak force is a non-abelian gauge symmetry (i.e. more complicated than electromagnetism) to which all currently observed particles other than the gluon play a role. Electroweak unification technically occurs only at high energies, such as in modern colliders. What we experience in the everyday world is a world of broken electroweak symmetry. The photon of QED, for example is not "Pure" EM (weak hypercharge) in the particle-physics sense. The Z and the W+/- are likewise low-energy phenomena (and not weak isospin). EM and Weak force get back to their natural state near 100 GeV energies, like in the first 10^-10 second since big bang.

http://hyperphysics.phy-astr.gsu.edu/hbase...o/unify.html#c1
http://www.pas.rochester.edu/~ksmcf/talks/loq.pdf
http://www.europhysicsnews.com/full/06/art...1/article1.html
http://en.wikipedia.org/wiki/Weak_hypercharge
http://en.wikipedia.org/wiki/Weak_isospin
http://en.wikipedia.org/wiki/Standard_mode...2C_Z_and_photon


SUSY (Supersymmetric) unification is predicted to happen at 10^16 GeV or the first 10^-38 second since big bang. The case for SUSY is still being built, but The Nobel Prize in Physics 1979 went to Sheldon Lee Glashow, Abdus Salam, and Steven Weinberg for a successful physical theory.
http://nobelprize.org/nobel_prizes/physics/laureates/1979/

What does the electroweak interaction do?
What form does it take?
How does light effect radioactivity?