§ Oysters
| Total beta activity in picocuries per gramme | ||
| Period | Mean Activity | |
| October-December, 1963 | … | 3.62 |
| January-March, 1964 | … | 3.62 |
| April-June, 1964 | … | 3.21 |
| July-September, 1964 | … | 3.26 |
| Activity of Zinc 65 in picocuries per gramme | ||
| Period | Mean Activity | |
| October-December, 1963 | … | 3.54 |
| January-March, 1964 | … | 3.17 |
| April-June, 1964 | … | 7.73 |
| July-September,1964 | … | 11.40 |
§
Comments
Total beta radioactivity measurements of oyster flesh show the persistence of small amounts of weapon-test fallout. The level of zinc 65 in oysters at the barrier wall has increased with the increased discharge rates but is still small compared with the maximum considered acceptable.