electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength
energy that is radiated or transmitted in the form of rays or waves or particles
the act of spreading outward from a central source
a radial arrangement of nerve fibers connecting different parts of the brain
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
the spread of a group of organisms into new habitats
the 3rd letter of the Greek alphabet
a unit of magnetic field strength equal to one-hundred-thousandth of an oersted
Portuguese navigator who led an expedition around the Cape of Good Hope in 1497; he sighted and named Natal on Christmas Day before crossing the Indian Ocean (1469-1524)
