The Electromagnetic Spectrum
GCSE Core Science (Physics) AQA revision
What is the electromagnetic spectrum?
. Gamma rays are emitted from stars and other radioactive substances
. Gamma rays are extremely high frequency rays and they carry a lot of energy
. They pass though most materials and they are so difficult to stop that you need lead or concrete to block them out
.Gamma rays are used in radiotherapy to kill cancer cells and this works because cancer cells can't repair themselves like ordinary body cells. This is why it is important to get the dosage right. Targeted radiotherapy is a radioactive substance used to kill cancer cells, but it is taken up by specific part of the body, so the rest of the body gets a low dose. In addition, an example of this be using radioactive iodine to treat cancer in the thyroid gland.