Across
- 4. The basic unit used to describe the intensity of radioactivity in a sample of material.
- 5. an *blank* of an element has the same atomic number but different number of neutrons
- 8. one of the subatomic particles. No electrical charge
- 9. The transformation of one element into another by a nuclear reaction.
- 11. the change of one radioactive nuclide into a different nuclei by the spontaneous emission of alpha, beta or gamma rays
- 13. The splitting of a heavy nucleus into two roughly equal parts
- 15. the emission of energy as electromagnetic waves or as moving subatomic particles
- 17. an electron (+ve or -ve) which has been emitted by an atomic nucleus or neutron
- 18. One of the subatomic particles. Positively charged
- 19. Non-radioactive
Down
- 1. One of several nuclides with the same number of neutrons and protons capable of existing for a measurable time in different nuclear energy states.
- 2. the core of an atom, where all of its positive charge is concentrated
- 3. The removal of radioactive contaminants by cleaning and washing with chemicals
- 6. a highly penetrating type of nuclear radiation
- 7. a positively charged particle made up of 2 protons and 2 neutrons
- 10. A general term denoting the quantity of radiation or energy absorbed in a specific mass.
- 12. Any material that stops ionizing radiation.
- 14. An electronic instrument that indicates, on a meter, the number of radiation induced pulses per minute
- 16. An atomic particle that is electrically charged, either negative or positive