Nuclear changes

3. the time when half of the radioactive substances decay.
5. fast moving particles that may even be positively charged.
6. are not made of matter and don't have a electrical charge.
8. the process of splitting heavier nuclei into lighter nuclei.
9. when very light nuclei are combined to form heavier nuclei.
12. the one eighth of the half-life after it decays.
13. an unstable nucleus emits one or more particles of high-energy electromagnetic radiation.
14. measurement of radiation absorbed by the human body.
15. are positively charged and are more massive than any other nuclear radiation.

1. released energy and matter.
2. the form of nuclear radiation that arises naturally.
4. the minimum amount of a substance that can under go a fission reaction.
7. Positively charged electrons.
10. are short-lived isotopes that then to concentrate in affected cells and are used to locate tumors.
11. the continuous series of nuclear fission.