| Radioactive source | Open sources | Sealed sources |
| Permission for the application in the country | Yes | Yes |
| Current status | Used | Used |
| Examples of present application | Leakage tests in refinery | Level gauges Density gauges Thickness gauges Coating thickness gauges Nucleonic balances (bulk flow meter) Concentration gauge Gamma scanning Analyzers and monitors |
| Requirements | National Atomic Energy Agency permission | National Atomic Energy Agency permission for use |
| Special requirements and restrictions | Provincial Sanitary and Epidemiological Station permission Office of Technical Inspection permission for pressure tests | Certificates PN-EN norms, ISO standards |