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We have observed four radicals in the ESR spectra of y-irradiated single crystals of some glutamic acid derivatives. These radicals, produced by gamma-irradiation, in single crystals of N-Acetyl-LGlutamic acid, L-Glutamic acid and DL-Glutamic acid hydrochloride were identified as CH3CONH, -C 3 H 5 , -CH. and -NH 2 radicals respectively.Free radicals produced by gamma irradiation in single crystals of N-Acetyl-L-Glutamic acid(l), LGlutamic acid (2) and DL-Glutamic acid hydrochloride (3) have been investigated between 100 and 350 K with ESR. The single crystal spectra have been taken at 5-degree intervals with the magnetic field B lying in each of the three crystallographic planes ab, be, and ca. Figure 1 shows the spectrum of 1 with its hyperFine splitting. In these spectra, 16-lines are observed due to CH3CONH and C3H5 radicals. Owing to the CH3CONH radical, the spectra exhibit an outer doublet (1:1) because of the proton directly attached to the nitrogen, and each of the outer lines splits into triplet lines (1:1:1) due to the nitrogen. Owing to the other allyl radical (C3H5) produced by gamma irradiation, inner 10-lines are also observed between these triplet lines. Inner doublet splittings are due to a-protons of the radical, then each line splits into Five lines (1:4:6:4:1) owing to the ^-protons of this radical. The proton splitting for the CH3CONH radical is about 8.9 mT, and the nitrogen splitting is approximately 0.8, 0.6, and 0.4 mT. The a and ß-proton splittings are approximately 3.4 and 0.6 mT, respectively. Such a result can arise if the unpaired electron interacts equally with the a-proton and to a somewhat lesser extent with four other equivalent ß-protons. The radical most likely formed in irradiated 1 which fits these requirements is the allyl radical (C3H5). The greater density of the electron at the nuclei of either a and ß protons farthest from the site of the unpaired electron can be accounted for in terms of conjugation. The