| Chemgas | | Chemgas supplies high purity rare gases and isotopically enriched gases. |
| CNL Scientific Resources, Inc. | | A supplier of isotopes, metals, crystals and other engineered materials to manufacturers of pharmaceuticals and instruments. |
| Gamma Radiation Sources | | CNEA (Argentina's nuclear energy agency) produces qualified cobalt-60 sources for irradiation plants and for medical use. |
| Gas Oils JSC | | Manufactures carbon 13 labeled carbon dioxide using lasers. |
| Hartmann Analytic GmbH | | Supplier of radio-labeled chemicals, products for radiation protection. Also offers labeling-services and custom synthesis. |
| Hyox18 | | Isotope O18 enriched water used to produce fluoro-deoxyglucose for PET. |
| Icon Services | | Supplier of compounds labeled with stable isotopes. |
| International Isotope Society | | The IIS provides a forum for all chemists involved in radiochemical synthesis and analysis to obtain and share information outside of their immediate area of employment and expertise. |
| Isoflex | | Stable isotopes for use in science, medicine and industry from Russian producers. |
| IsoSciences | | Custom stable isotope labeling and small scale organic synthesis including the preparation of metabolites and PET precursors and standards. |
| Isotec | | A member of the Sigma-Aldrich family, manufacturer of stable isotope labeled compounds. |
| MDS Nordion | | Radioisotope technology used to prevent, diagnose and treat disease. Products and services include nuclear medicine, radiation therapy for cancer, irradiation sterilization and food irradiation. |
| Moravek Radiochemicals | | Manufacturer of tritium and carbon 14 labeled radiochemicals for AIDS and cancer research. |
| Omicron Biochemicals Inc. | | Supplier of single, multiple and uniform stable isotope labeled saccharides and nucleosides (13C, 2H, 15N, 18O). |
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