Paramagnetic molecular centers produced by ? irradiation at 77 K and at room temperature in the novel compound <tex-math>${\rm Al}_{5}({\rm OH})_{15}({\rm Asp})_{3}\cdot 3{\rm H}_{2}{\rm O}$</tex-math> were studied by ESR spectroscopy. The g value of 2.0034 and the lack of such lines in pure aluminum hydroxide suggested that all the paramagnetic centers observed are related to the aspartic acid molecule. However, none of the paramagnetic centers gave an ESR spectrum characteristic for ?-irradiated pure aspartic acid powder. The influence of the oxygen on the formation of the paramagnetic centers was noticed. The extreme stability of the paramagnetic molecular centers formed in <tex-math>${\rm Al}_{5}({\rm OH})_{15}({\rm Asp})_{3}\cdot 3{\rm H}_{2}{\rm O}$</tex-math> suggests that aspartic acid complexed in aluminum hydroxide is a good trap for ?-radiation energy.

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