Radiation

From Wikipedia, a free encyclopedia written in simple English for easy reading.

Radiation is a process in physics where particles or energy are emitted from something. There are many types of radiation, including:

Radiation can be produced by many different things. Some radiation can go through the human body and other objects. Usually when people use the term radiation, they are talking specifically about potentially harmful types of radiation. If something produces radiation, we can say it is radioactive.

There is a little radiation all around us all the time, which people's bodies are used to, but larger amounts of radiation can make people sick or kill them. Natural radiation is produced by some chemical elements, such as uranium, and by stars and other things in outer space. Some things that are radioactive only stay radioactive for much less than a second. Other things can stay radioactive for thousands of years.

People can also make radiation. Some of the machines that make radiation are called cyclotrons, linear accelerators and particle accelerators. Scientists use these machines to make radiation so they can study it. X-ray machines make radiation so doctors can see the inside of the human body and help people. Nuclear weapons (atomic weapons) make a huge amount of radiation very fast, in order to destroy buildings and kill people.

Nuclear reactors are used to make electricity. They make a lot of radiation, but the reactors are built carefully to keep the radiation inside the reactor. But many people are afraid that if there were a problem with the reactor, the radiation could escape into the environment, harming or killing many animals and people. Also, the parts of the reactor stay radioactive, and can kill people, for hundreds or thousands of years, so people aren't sure where they can keep parts of old reactors safely away from people.