Physics -RADIATION 0.0 / 5 ? PhysicsRadioactivityGCSEAQA Created by: chloesrevisingCreated on: 29-11-20 18:37 WHAT IS NUCLEAR FUSION when two light nuclei join topgether to make on heavy one some mass converted to energy and used for radiation 1 of 9 WHAT IS NUCLEAR FISSION when a large unstable nucleus absorbs an extra neutron and splits into 2 equal smaller nuclei -gamma radiation emitted - energy released -2/3 electrons emitted that cause chain reaction 2 of 9 WHAT IS RADIOACTIVE DECAY nuclear radiation emitted by usnatble atomic nuceli so they bcomre mopre stable., 3 of 9 ALPHA PARTICLE : 2 PROTONS AND 2 NEUTRONS nucleus: loses 2 protons and 2 neutrons ionsing: highest range: a few cm, in air stopped by: sheet of paper 4 of 9 BETA PARTICLE: FAST MOVING ELECTRON nucleuis: neutron changes into proton and an electron ionising: high range: 1m in air stopped y=by: a few mm of aliminium 5 of 9 GAMMA RADIATION: SHORT WAVELENGTH, HIGH FREQUENCY nucleus: energy transferred away from nucleus ionising: low range: unlimited in air stopped by: cm of thick lead/ m of concrete 6 of 9 WHATS THE ACTIVITY OF A RADIOACTIVE SOURCE the rate of decay of an usnatrbl;e nucleus measured in Bq 1 Bq = 1 decay per second 7 of 9 HALF LIFE time for half the nummber of unstable nuclei in a smaple to decay count rate/actiivty of source to halve 8 of 9 WHATS IRRIDAION WHATS CONTAMINATION when ana object is exposed to nuclear radiaion when atoms of a radioactive material are in/on an object 9 of 9
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