Radiation
Across
- 3. Time taken for number of radioactive nuclei in an isotope to halve.
- 5. Strongly ionising.
- 7. objects near radioactive source that is irradiated by it.
Down
- 1. Unwanted radioactive particles get onto an object.
- 2. Moderately ionising.
- 4. Very penetrating
- 6. low level radiation