Low level determination of (226)Ra in water using a micro-precipitate track method for large-scale environmental monitoring

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
M TaheriM M Montazer Rahmati

Abstract

In the present paper a method has been developed for the determination of (226)Ra in water by the detection, using a solid-state nuclear track detector (SSNTD), of alpha particles from (226)Ra in equilibrium with (222)Rn in micro-precipitates collected on a filter. The micro-precipitates were prepared from environmental water samples by collection of radium with lead as Pb/RaSO(4). Several factors affect the (226)Ra precipitation on the filter and its recovery, in particular the filter pore size. Therefore in this experiment Whatman #42 and Millipore filters with different pore sizes were used. Using a 0.45 microm Millipore filter, the recovery efficiency was increased up to 96%, and the alpha self-absorption and scattering decreased remarkably. For efficient detection of alphas from (226)Ra/(222)Rn in equilibrium, three types of SSNTD were used-polycarbonate (PC) electrochemically etched (ECE), CR-39 and LR-115 chemically etched (CE). By preparing a standard micro-precipitate on a filter with known (226)Ra/(222)Rn characteristics, the calibration response of each detector and its minimum detection limit (MDL) were determined.

References

Feb 13, 2002·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·M KöhlerB Knobus

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Citations

Jan 21, 2015·Radiation Protection Dosimetry·Mehdi SohrabiJahangir Mohammadi
May 15, 2015·Radiation Protection Dosimetry·M Sohrabi, F Khodadadi

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