Liquid scintillation counting (LSC) is an adequate nuclear technique to determine radioactivity levels, as verified by this study for the determination of the gross alpha and beta activities of aqueous samples because of its simplicity and low associated cost comparison with other techniques. This paper discusses a new approach to the monitoring of gross alpha and gross beta activities in water. The method consists of using pulse decay discrimination (PDD) liquid scintillation counting LSC of 2 ml of the sample after conditioning with 12 ml of AB-Ultima Gold LSC cocktail, and PDD 139 condition. Different factors that affected on the counting efficiency were studied such as quench reaction, volume of sample, and type of vial. The gross alpha and gross beta particle activity measurement using 40K and 243Am with different activities concentration for efficiency determination. The calculated detection limits were 0.07 Bq/l and 0.12 Bq/l for gross alpha and gross beta respectively for 500 min measurements of samples produced by concentration of one liter of water.
 L. Bittman, M. Furstand and H. Kallmann, “Decay Times, Fluorescent Efficiencies, and Energy Storage Properties for Various Substances with Gamma-Ray or Alpha-Particle Excitation,” Physical Review, Vol. 87, No. 1, 1952, pp. 83-86. doi:10.1103/PhysRev.87.83
 T. Marrod’an Undagoitia, F. von Feilitzsch, L. Oberauer, W. Potzel, A. Ulrich, J. Winter and M. Wurm, “Fluorescence Decay-Time Constants in Organic Liquid Scintillators,” Journal of Review of Scientific Instruments, Vol. 80, No. 4, 2009, Article ID: 043301.
 R. Voltz, H. Dupont and G. Laustriat, “Radioluminescence des Milieux Organiques. II. Vérification Expérimentale de l'étude Cinétique,” Journal de Physique, Vol. 29, No. 4, 1968, pp. 297-305. doi:10.1051/jphys:01968002904029700
 F. Spurny, “Radio-Luminescence in Organic Liquids. II. Basis of the Delayed Component in Benzene and Toluene,” Collection of Czechoslovak Chemical Communications, Vol. 35, No. 2, 1970, pp. 565-575. doi:10.1135/cccc19700565
 I. B. Berlman and O. J. Steingraber, “Liquid Scintillation Solutions for Puls Decay Discrimination,” Nuclear Instruments and Methods, Vol. 108, No. 3, 1973, pp. 587-591. doi:10.1016/0029-554X(73)90542-9
 F. D. Fabiana and T. T. Maria Helena, “Total Alpha and Beta Determination by Liquid Scintillation Counting in Water Samples from a Brazilian Inter-Comparison Exercise,” International Nuclear Atlantic Conference INAC, Brazil, 2009.
 N. Q. Mien and B. V. Loat, “Determination of the Annual Beta Dose by Measuring Beta Activity Using the Liquid Scintillation Technique,” Journal of Science, Mathematics, Physics, Vol. 24, No. 1, 2008, pp. 36-41.
 Z. Hamzah, M. Alias and Z. Ahmad, “Discriminator Setting and Cocktail Preparation for Analysis of Alpha and Beta Emitters in Aqueous Solution Using Liquid Scintillation Counter,” The Malaysian Journal of Analytical Sciences, Vol. 15, No. 1, 2011, pp. 27-36.
 Yu. Yufu, B. Salbu, H. E. Bjoernstad and H. Lien, “Improvement for α-Energy Resolution in Determination of Low Level Plutonium by Liquid Scintillation Counting,” Journal of Radioanalytical and Nuclear Chemistry Letters, Vol. 45 No. 5, 1990, p. 345. doi:10.1007/BF02165075
 International Atomic Energy Agency (IAEA), “Analytical Methodology for the Determination of Radium Isotopes in Environmental Samples,” Analytical Quality in Nuclear Applications No. IAEA/AQ/19, 2010.
 R. I. Kleinschmidt, “Gross Alpha and Beta Activity Analysis in Water—A Routine Laboratory Method Using Liquid Scintillation Analysis,” Journal Applied Radiation and Isotopes, Vol. 61, No. 21, 2004, pp. 333-338.