Physics 0.0 / 5 ? PhysicsRadioactivityGCSEOCR Created by: hannah.monksCreated on: 18-04-16 19:26 What is an isotope? Atoms with the same number of protons but different neutrons. 1 of 12 What are elements that are radioactive? Elements that emit ionising radiation all the time. 2 of 12 Describe an alpha particle Relatively big and heavy and move slowly, do not penetrate into materials. 3 of 12 Describe a beta particle Move quite fast and are quite small, they penetrate moderately into materials. 4 of 12 Describe what gamma radiation does. If a nucleus needs to get rid of some energy it emit gamma rays. 5 of 12 What can block alpha, beta and gamma particles? Alpha- Paper and skin Beta- Thin aliminium Gamma- Thick lead and very thick concrete. 6 of 12 Define the term half-life. Time taken for half of the radioactive nuclei now present to decay. 7 of 12 What is a strong force? The nucleus contains positively chaarged protons which repel each other, but they dont fly apart because they are held together by a strong force. 8 of 12 What is nuclear fusion? Where two nuclei fuse to create a larger nucleus and releasing energy. 9 of 12 What causes ionisation? When ionising radiatipn break up their molecules into small bits called ions which are chemically reactive they react with things. 10 of 12 Definition of irradation. Being exposed to radiation without being in contact with the source. 11 of 12 Definition of contamination. Picking up radioactive materials for example breathing it in or getting it on your skin. 12 of 12
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