Why do we usually use isotopes emitting gamma radiations as radioactive tracers in medical science ?
[Hint : gamma radiations are most penetrating]

State one industrial use of alpha, beta, and gamma radiation.

State the penetrating range in air for the alpha , beta and gamma radiations.

A radioactive source emits three type of radiations. (a) Name the three radiations. (b) Name the radiations which are deflected by the electric field. ( c) Name the radiation which is most penetrating. (d) Name the radiation which travels with the speed of light. (e) Name the radiation which has the highest ionising power. (f) Name the radiation consisting of the same kind of particles as the cathode rays.

What happens to the mass number and atomic number of an element when it emits gamma- radiation

(a) What is the composition of alpha , beta and gamma radiations? (b) Can a hydrogen (""_(1)^(1) H) nucleus emit an alpha particle ? ( c) Which one alpha , beta or gamma radiation has the least penetrating power ?

The penetrating powers of alpha and beta and gamma radiations, in decreasing order, are

A radioactive sample is kept at the centre of an evacuated spherical vessel. (a) Out of the alpha , beta and gamma radiations, name the radiations which are (i) safe and (ii) unsafe. (b) Suggest two ways for more safety. ( c) Does evacuation of vessel help in safety ?