recently ex kgb man in london murder by radio active material in drink. what was the material. how it is posst

Question

that perticular material even can not pass through the skin.

Answer 1

it was a radio-active isotope of polonium.

Answer 2

Yes, that is why it was used to poison him. If you are trying to poison someone, you don't want to poison yourself in the process. While it cannot be diffused through your skin, it can be diffused through your small intestine into your blood stream, thus killing you.