 |
| radioactive source: 27 phrases in 15 subjects |
| Ecology | 2 |
| Electronics | 1 |
| Energy industry | 2 |
| Makarov | 4 |
| Medical | 1 |
| Medical appliances | 4 |
| Metrology | 2 |
| Natural resourses and wildlife conservation | 2 |
| Nuclear and fusion power | 2 |
| Nuclear physics | 2 |
| Occupational health & safety | 1 |
| Oilfields | 1 |
| Politics | 1 |
| Shipbuilding | 1 |
| Technology | 1 |