ABNORMAL CONCENTRATION DEPENDENCES FOR ACTIVATION OF RADIOTHERMOLUMINESCENCE OF AQUEOUS SULFURIC-ACID-SOLUTIONS BY THE IONS OF RUTHENUIM(2+) BIPYRIDYL COMPLEX [RU(BIPY)(3)](2+)

Radiothermoluminescence of aqueous H2SO4 solutions activated by the ru thenium complex [Ru(bipy)(3)]Cl-2 was studied. The spectra of radiothe rmoluminescence in the maximum at 120 K and of isothermal glow at 77 K were recorded. [Ru(bipy)(3)](2+) is the emitter of the glow. The dif ferences in shape between the spectra of isothermal emission and of ra diothermoluminescence are explained by the multiphase composition of t he frozen solution. Bleaching of the isothermal emission with visible light was found at 77 K, which is explained by participation of solvat ed electrons in recombination processes. The very strong dependence of the radiothermoluminescence brightness on the concentration of Ru(2+) ions is characterized by a downwardly concave curve (with increasing derivative) and has no trend for limitation. The activator not only se rves as the energy acceptor, but also is involved in chemiluminescent redox reactions of radiolysis products, e.g., Ru(bipy)(3)](+) + (OH, S O4-) --> [Ru(bipy)(3)](2+) + (OH-, SO42-) and [Ru(bipy)(3)](3+) + (e( aq), H, [Ru(bipy)(3)](+)) --> [Ru(bipy)(3)](2+) + (H+, [Ru(bipy)(3)](2 +)).