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| tracer | |||
| marker | |||
| tracer A minute quantity of radioactive isotope used in medicine or biology to study the chemical changes within living tissues | |||
| Tracer: 28 phrases in 13 subjects |
| Chemistry | 4 |
| Earth sciences | 2 |
| Environment | 7 |
| General | 3 |
| Health care | 1 |
| Medical | 2 |
| Medical appliances | 1 |
| Metallurgy | 1 |
| Mining | 1 |
| Natural resourses and wildlife conservation | 2 |
| Physics | 2 |
| Technology | 1 |
| Textile industry | 1 |