| Autor: |
Semenishchev, V. S., Betenekov, N. D., Tomashova, L. A., Voronina, A. V. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2017, Vol. 1886 Issue 1, p1-6, 6p, 1 Diagram, 2 Charts, 4 Graphs |
| Abstrakt: |
Activity of 224Ra and 226Ra were determined in some types of natural drinking water. An improved method of radiochemical analysis of radium was developed. The method included radium preconcentration by the granulated titanium dioxide and further thin alpha source preparation by radium sorption onto a thin-layer manganese dioxide disk based on cellulose triacetate (MnO2-CTA). It was shown that time of radium sorption on MnO2-CTA should be 1 day; sorption degree of 75 % was achieved. Longer sorption resulted in sorption degree of 85 % but the quality of alpha spectrum was lower due to radium diffusion into the MnO2 film. 22 samples of commercially available mineral waters, 4 samples from springs and 4 samples from wells near Yekaterinburg city were analyzed. The results demonstrated that mineral waters contain more 224Ra (0.4-125 mBq L-1) than fresh underground water (0.5-29 mBq L-1); no samples were found with226Ra activity exceeding maximum allowable level (490 mBq L-1). Activities of224Ra in fresh waters were found to be 0.5 to 20 mBq L-1 that was also less than the maximum allowable level. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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