A method for obtaining the pure annihilation peak of 22Na radioisotope

By means of pulse separation technique, the annihilation gamma ray peak, which has great importance for positron annihilation lifetime spectroscopy (PALS), was discriminated from the superimposed photon spectrum generated by Compton effect, backscattering, and background in the 0.5 MeV energy region. Energy resolution of 4.5% was obtained for the discriminated annihilation peak of 22Na positron emitter radioisotope. © 2005 Elsevier Ltd. All rights reserved.This work was supported by TUBITAK, the Scientific and Technical Research Council of Turkey under Project no. TBAG-1683(197T087) and by EBILTEM, Center of Science and Technology, Ege University under Project no. 99 BIL 001. The author (C. Celiktas) thanks Dr. S. Selvi for his kind helps and presents his appreciation to Dr. U. Yahsi for providing the radioisotope. -