| Acronym | Meaning |
| TCID50 | 50% Tissue Culture Infective Dose |
| PINS | Portable Isotopic Neutron Spectroscopy |
| SCCSA | Self-consistent Central-site Approxn. (for D.-of-states) |
| HETG | High-energy Transmission Grating |
| RIGS | Radioimmunoguided Surgery |
| EFIG | Emission Factor Inventory Grouppar |
| CMF | Crossflow Microfiltration |
| EBS | Electron Backscattering |
| DIM | Dissolved Inorganic Matter |
| ACATS | Airborne Chromatograph For Atmospheric Trace Species |