A hospital keeps a sealed container of radioactive waste in a shielded store until its activity is low enough for disposal.
The storage record is incomplete.
| Record entry | Value |
|---|---|
| activity when placed in the store | 7200 Bq7200\ \text{Bq}7200 Bq |
| half-life | 6 days6\ \text{days}6 days |
| time in the store | 18 days18\ \text{days}18 days |
| activity now | ______ |
Calculate the value that should be entered for the activity now.
97 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.