Gamma radiation is composed of the stable form of nuclei and most important Helium Atom is released in this reaction !
gamma radiation is due to fission in which the radioactive substance is bombarded and as a result a stable form of that element is formed and a Helium atom !
Answer:
The equilibrium temperature of the surface of the moon can be found by the formula as follows:

Where
is the solar constant and
is the Stefan's Boltzmann constant.

Thus, the equilibrium temperature of the surface of the moon is 273 K.