Across
- 2. a particle of 2 protons and two neutrons emitted by an atomic nucleus during radioactive decay
- 6. A tool to measure the count rate of a radiation
- 8. ___________ radiation is the low levels radiation from the environment to which we are exposed all the time
- 10. an electron emitted by a nucleus during radioactive decay
- 11. the radioactive material used in a smoke detector
Down
- 1. energy spreading out from a source carried by particles or waves
- 3. the number of decaying radioactive atoms detected eac second
- 4. ___________ substance is a substance that decays by emitting radiation from its atomic nuclei
- 5. one kind of natural radiation source that is received the most by people
- 7. the average time taken for half the atoms in a sample of a radioacive material to decay
- 9. type of radiation that can penetrate really far