Radioactive disintergation always follow `I` order kinetics and is independent of all external factors and is represented by the relation `N = N_(0) e^(-lambda t)` where `lambda` is decay constant and `N` atoms are left at time `t`. The radioactive nature of element is expressed in terms of average life numerically equal to decay constant `(1//lambda)` however all the radioactive do not lose their radioactive nature in thier average life. The radioactive emission involves `alpha, beta` particles as well as `gamma-` rays.The penertrating power order is `alpha lt beta lt gamma`. The emissions can perntrate even thick steel walls but are however unable to penttrate `Pb` blocks. The `S` unit fo rate of decay is `dps`.
Which one cause more damage to humain tissue if exposed to radioacitve emission out of `alpha` or `beta-` paricles?

Options

A. `alpha-` particles
B. `beta-` particles
C. Equal
D. None of these

Answer

`a`

Explanation

`alpha-` particles because of less penetration power gives maximum energy at one spot.