Zaidoon H.  Ibrahim, Ahmed. Fadhil.  Mkhaiber, S.K.  Al-Nasri, 
    Estimation of Concentration of Radioactive Elements for the Liquid Waste Pool in
Radiochemistry Laboratories in Al Tuwaitha Site Baghdad-Iraq,
    Journal of Engineering and Applied Sciences,
    Volume 13,Issue 10,
    2018,
    Pages 3386-3391,
    ISSN 1816-949x,
    jeasci.2018.3386.3391,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2018.3386.3391)
    Abstract: The aim of this research is estimating the total radioactivity for the High Level Liquid Waste pool
(HLLW) in the radiochemistry waste hall in Al-Tuwaitha site. The collected samples from this pool analyzed
by using two techniques, the first is gamma spectroscopy system with High Purity Germanium Detector (HPGe)
to measure the radioactivity concentration of gamma-ray emitters and to identify their isotopes. The results of
measurements show that the average radioactivity concentration of Cesium (<sup>137</sup>Cs) equal to 2.085 MBq/L. The
second technique is gross alpha beta counter by using (LUDLUM 3030) device with zinc sulfide scintillation
detector ZnS (Ag) to measure the radioactivity concentrations of the other radionuclides which are not
gamma-ray emitters for the same samples that can not be detected in the first method. Cesium-<sup>137</sup> has separated
from these samples by evaporation process because it also emmit beta particles associated with gamma
photons, the remaining activity is (3.0054 MBq/L). According to work history of the radiochemistry laboratories
this waste is nuclear fission products for Uranium-235 (<sup>235</sup>U) isotope, therefore, the remaining activity refers to
Strontium-90 (<sup>90</sup>Sr) radionuclide due to its long half-life.
    Keywords: Gamma-ray;emmit;laboratories;waste;isotope;half-life