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We have determined the isomeric ratios in photonuclear reactions 116 Cd(γ, n) 115m,g Cd, 138 Ce(γ, n) 137m,g Ce, 153 Eu(γ, n) 152m,g Eu, 96 Mo(γ, p) 95m,g Nb, 118 Sn(γ, p) 117m,g In, 89 Y(γ, 2n) 87m,g Y, 106 Cd(γ, np) 104m,g Ag and 112 Sn(γ, np) 110m,g In induced by bremsstrahlungs with end-point energies in the Giant Dipole Resonance (GDR) region. The targets were irradiated at electron accelerator Microtron MT-25 of the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna. Gamma spectra of irradiated samples were measured with a spectroscopic system consisting of 8192-channel analyzer and high-energy resolution (180 keV at gamma ray 1332 keV of 60 Co) semiconductor detector CANBERRA. The results were discussed and compared with those of other authors. •μ¢¥¤¥´μ¨¸¸²¥¤μ¢ ´¨¥¨ §μ³¥•´ÒÌ μÉ´μÏ¥´¨°¢ ËμÉμÖ¤¥•´ÒÌ •¥ ±Í¨ÖÌ 116 Cd(γ, n) 115m,g Cd, 138 Ce(γ, n) 137m,g Ce, 153 Eu(γ, n) 152m,g Eu, 96 Mo(γ, p) 95m,g Nb, 118 Sn(γ, p) 117m,g In, 89 Y(γ, 2n) 87m,g Y, 106 Cd(γ, np) 104m,g Ag¨1 12 Sn(γ, np) 110m,g ¢ μ¡² ¸É¨£¨£ ´É¸±μ£μ ¤¨ ¶μ²Ó´μ£μ •¥ §μ´ ´¸. ¡μÉÊ ¶•μ¢μ¤¨²¨´ ³¨±•μÉ•μ´¥ OE'-25 ‹Ÿ ˆŸˆ.ˆ §μ³¥•´Ò¥ μÉ´μÏ¥´¨Ö μ ¶•¥¤¥²Ö²¨¨ §¸¥•¨£ ³³-¸ ¶¥±É•μ¢,¨ §³¥•¥´´ÒÌ HPGe-¤¥É¥±Éμ•μ³¸³´μ£μ± ´ ²Ó´Ò³ ´ ²¨ § Éμ•μ³. •μ¢¥¤¥´Ò μ¡¸Ê¦¤¥´¨¥¨¸• ¢´¥´¨¥ ¶μ²ÊÎ¥´´ÒÌ ¤ ´´Ò̸•¥ §Ê²ÓÉ É ³¨¤•Ê£¨Ì ¢Éμ•μ¢.

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Mictrorons are accelerators of electrons and are simultaneous sources of bremsstrahlung photon flux and fission neutrons. In 1982, a microtron of seventeen trajectories Microtron MT - 17 was put into operation at the National Institute of Physics of Vietnam. Though very modest, microtons are very useful for developing countries such as Vietnam in both fundamental and applied physics research. During the recent years by using the above mentioned MT - 17 and microtrons from other institutes we have carried out different investigations. In this report we present some results obtained in the studies of photonuclear reactions and photon activation analysis in the giant dipole resonance region.