The decay kinetics of benzophenone (BP) triplet state in the thin (similar to 200 nm) films of poly(dimethylsiloxane) have been studied with a nanosecond laser flash photolysis technique. Decay kinetics of a triplet state of BP ((BP)-B-3) is dispersive kinetics, and it can be well described by the kinetic law with Gaussian distribution of the activation free energy. The average rate constants of (BP)-B-3 decay k(av) are 1500 and 70 s(-1) for air saturated and deoxygenated films, respectively. Width of distribution are 1.2 and 4.3 (dimensionless) and correspond to the first and second kav, respectively presented above. The rate of hydrogen abstraction of H-atom from Si-CH3 groups by (BP)-B-3 is low which results in long-lived (BP)-B-3 in silicone films. (C) 2013 Elsevier B.V. All rights reserved.