Various rules of thumb have seen proposed by the scientific community to expalin the mode of radioactive decay by various radioisotopes. One of the major rules is called the `n//p` ratio. If all the known isotopes of the elemnts are plotted on a graph of number of neutrons (n) versus number of protons (p), it is observed that all isotopes lying outside of a ''stable'' `n//p` ratio region are radioactive as shown fig.5.28. The graph exhibits straight line behaviour with unit slope up to `p=25`. Above `p=25`, tgose isotopes with `n//p` ratios lying above the stable region usually undergo beta decay. Very heavy isotopes `(pgt83)` are unstable because of their relativley large nuclei and they undergo alpha decay. Gamma ray emission does not involve the release of a particle. It represnts a change in an atom from a higher energy level to a lower energy level.

Which of the following represents the relative penetrating power of the three types of radioactive emission in decreasing order?

Options

A. `beta gt alpha gt gamma`
B. `beta gt gamma gt alpha`
C. `gamma` gt `alpha gt beta`
D. `gamma gt beta gt alpha`

Answer

D

Explanation

Depends on ionization power.