Prompt gamma ray activation analysis for determination of boron in aqueous solutions

Prompt gamma-ray activation analysis (PGAA) is a non-destructive nuclear analytical technique used for identification and quantification of trace and other elements contained in an examined sample. PGAA consists in detection of prompt gamma rays emitted by a sample during irradiation by thermal or cold neutrons. These samples can be in solid, aqueous or gaseous form. In particular, PGAA is suitable for detection and measurement of boron concentration. The precision of measurement reaches ppm or even ppb levels depending on the sample matrix. Moreover, the risk of contamination by boron is extremely low compared to other analytical methods. Trace analysis of boron in liquid was performed and characterized at the PGA facility of the neutron spallation source SINQ (Paul Scherrer Institute, Switzerland). First, a calibration curve was determined with standard boron solutions. According to this curve, amount of boron in geological water samples was determined and compared with results of chemical method ICP-MS. Finally, application of boron solutions in medical treatment methods is discussed.