noun

the nucleus of a helium atom that is produced by some radioactive substances

adjective

relating to or using the energy that is produced by splitting atoms (=breaking them apart)

noun

a unit for measuring radioactivity

noun

a method of finding out the age of a very old object by measuring the amount of radioactive carbon it contains

noun

a form of radiation that reaches the Earth from space

noun

cosmic radiation

noun

the electromagnetic radiation from computers and mobile phones, that some people think is harmful to health

noun

the process of dividing an atom in order to create energy

noun

a type of radiation with a very short wavelength that can pass through solid objects

noun

a piece of equipment that finds and measures radioactivity

noun

the amount of time that is needed for a substance to lose one half of its radioactivity

noun

a type of electromagnetic wave used in radio communication, radar, and cooking

noun

a radioactive substance used in making nuclear power

adjective

radiant heat is the energy produced by hot objects. It is in the form of infrared light that cannot be seen.

noun

a form of energy produced during a nuclear reaction that is used for making electrical power but can also kill or harm humans who receive too much of it

noun

consisting of radiation, or caused by radiation

noun

a type of energy that is sent out in the form of electromagnetic waves, for example, heat, light, or radio waves

adjective

a radioactive substance contains a very harmful form of energy that is produced during nuclear reactions. This energy is called radiation.

noun

the harmful waste that is produced while making nuclear energy

noun

a form of energy that is produced by a radioactive substance and is harmful in large amounts

noun

the ability that some substances have to produce energy in the form of radiation

noun

a radioactive element used in the treatment of cancer

noun

a type of radioactive gas that is produced when radium separates into the parts it is made of

adjective

relating to a radioactive substance whose nucleus breaks down to release radioactivity

noun

a chemical element that is a metal and is used for producing nuclear energy because it is radioactive

noun

a type of radiation that is used for looking inside things, for example your body or a suitcase