Relation between free radicals

and ultraviolet absorption in irradiated

Polymethyl Methacrylate doped with squalene

M.Trihi1*, J. L. Duroux2, A. Hoummada1

1Laboratoire de Physique Nucléaire, Faculté des Sciences Aïn Chock, Université Hassan II, B.P.5366, Casablanca, Maroc2Laboratoire de Biophysique Pharmaceutique, Faculté de Pharmacie, 2, rue du Dr Marcland, 87025 Limoges, France

* Corresponding author. E-mail :

Received 20 November 2000 ; revised version accepted 08 June 2001


A relation between the radiation-induced nine-line electron spin resonance signal and the unstable component of the optical absorption in the near ultraviolet of Polymethyl methacrylate doped with squalene is made on the basis of the radiation dose relationship. It is concluded that this correlation is applicable several days following irradiation.

This good correlation shows that the absorption and the ESR (Electron Spin Resonance) spectrum of irradiated PMMA doped with squalene are due to the same species or two species having the same radiochemical precursor.

The best model for the ESR response as a function of the spectrophotometric response is a linear regression.

Keywords : Polymethyl Methacrylate; Squalene; Ionizing radiation; Dosimetry.

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