LOOKING backward we can see very clearly the monumental character of the discovery of the X-rays by Wilhelm Conrad Roöntgen in November 1895. This was truly the beginning of the ‘new physics ...

ORNL isotopes have been involved in the discovery of elements 61 ... the nuclear structure of the atom, discovered alpha and beta rays and proposed the laws of radioactive decay.

There he met J.J. Thomson (who would soon discover the electron), and Thomson encouraged him to study recently-discovered x-rays ... negatively charged, or alpha and beta. He showed that every ...

Following the discovery of x-rays and radioactivity his imaginative work inspired ... emitting characteristic radiations: alpha and beta particles and gamma rays. He received the Nobel Prize in ...

This is because the particles or rays become more spread out. The thicker the substance, the more the radiation is absorbed. Alpha, beta and gamma radiations penetrate materials in different ways.