I hope that I am not breaking any rules, but these great resources no longer appear to be online. Can’t believe they are 20 years old!
The first photos show the background count rate, a reading of counts taken over a 1 minute period. The source is then taken out at 9:00 am and a count taken between 9:00 and 9:01, readings are then taken every 15 mins.
| Time & Counter | Close up ratemeter |
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 | Photo missing count rate= 570 |
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| Background count | |||
| Time | Time from start | Count rate | corrected count |
| (hours) | (mins) | (cpm) | (cpm) |
| 09:00 | 0 | ||
| 09:15 | 15 | ||
| 09:30 | 30 | ||
| 09:45 | 45 | ||
| 10:00 | 60 | ||
| 10:15 | 75 | ||
| 10:30 | 90 | ||
| 10:45 | 105 | ||
| 11:00 | 120 | ||
| 11:15 | 135 | ||
| 11:30 | 150 | ||
| 11:45 | 165 | ||
| 12:00 | 180 |
