2018, Volume 21, Issue 1
Establishing routine procedure of radium 226 activity concentration determination in water samples using liquid scintillation counting
National Research and Development Institute for Cryogenics and Isotopic Technologies - ICSI Rm. Valcea, Uzinei Street no. 4, PO Box Râureni 7, 240050, Râmnicu Vâlcea, Romania
*Corresponding authors: Carmen Varlam, E-mail: Carmen.Varlam@icsi.ro, Phone: 0250/732 744, Fax: 0250/732 746
The consumption of drinking water containing radium (Ra-226 and Ra-228) can lead to the accumulation of these radionuclides in the body, contributing to the radiological dose. This fact conducted to the necessity of establishing a measurement procedure for the two radionuclides. In this work, the procedural steps for measuring Ra-226 activity by liquid scintillation counting are set-up. The procedure involved applying the principle of ISO 13165-1. Alpha beta discrimination (Pulse Shape Analyse, PSA, for a Quantulus 1220 liquid scintillation counter) at different levels were used for a known activity of Ra-226, in order to establish optimum discrimination between alfa-emission of Rn-222 and its short-lived progenies. The optimal PSA parameter for ?/? discrimination was set to 60. Different type of water samples from Pascoaia geographical area were measured and low concentration of Ra-226 observed concluded that the main source of those waters is precipitation.
liquid scintillation counting, Radium, aqueous samples
Tag search liquid scintillation counting Radium aqueous samples