External magnetic fields (45-200mT) did not affect the X-ray- and ultraviolet (UV)-induced cell killing rates determined by measuring numbers of colony formation in cultured mammalian cells. A magnetic field (80mT) did not influence the relative yield of UV-induced DNA damage (both cyclobutane pyrimidine dimers and (6-4) photodimers) in calf thymus DNA detected by the enzyme-linked immunosorbent assay (ELISA) with a monoclonal antibody. No magnetic field effect was also observed on the formation of UV-B-induced cyclobutane thymine dimer in the presence of acetophenone as triplet sensitizer.
