GCSE physics radioactivity

5. the name for when radioactive material is moved from one location to another
6. the mass number of carbon-12
7. gamma is an __________________ wave
10. this material absorbs (and therefore blocks) alpha radiation
11. What is the mass of an alpha particle?
12. how many neutrons are there in an alpha particle?
15. when something or someone is "hit" with radiation but not contaminated
18. all isotopes of this element are radioactive and have 92 protons (use periodic table)
19. are damaged or killed by ionising radiation.
21. this type of radiation is absorbed (stopped by) about 5 mm of aluminium
22. Counts radioactivity (_________ counter)

1. the name of the scientist who did the gold foil experiment and discovered the nucleus
2. A radioactive material has a half life of 5 days. A sample contains 32 grams of the radioactive material. After 20 days, how many grams of the material will still be radioactive?
3. Time taken for half the radioisotopes to decay (______ life)
4. a large molecule found within your cells and carries genetic information (e.g. instructions for how to make proteins). Radiation can cause mutations to this molecule.
6. the surname of the sceintist that proposed the plum pudding model
8. the most penetrating but least ionising radiation
9. when an atom or molecule loses or gains electrons, it becomes a charged particle called an ______
10. alpha and beta are this type of radiation because they have mass, but gamma is not.
13. a thick layer of this material absorbs gamma radiation. May be found in hospitals to protect the radiographer.
14. The count rate of a radioisotope fell from 6000 cpm to 375 cpm in 24 mins. The half life is ____ minutes
16. the most ionising yet least penetrating radiation
17. name of the model of the atom that has a positive nucleus with electrons surrounding it
20. Which sub-atomic particles were the "plums" in the plum pudding model?