科研之友
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摘要
Groundwater, once surfaced, may contain some radioactive elements that can increase the natural radioactivity levels of different environmental factors, having a varied impact on the ionizing radiation dose received by the human body. This paper presents radium in groundwater concentration measurements from various galleries of disused mines. The studied area is located in Gutai, Rodna and Maramures Mountains, in the northern region of Transylvania, Romania. In order to determine the radium concentration in the collected water samples, two methods were used, both based on radium and its decay product, radon, secular equilibrium. After achieving the radioactive balance, the radon was measured using two types of scintillation Lucas cells. The obtained values of radium concentration range from 20 to 510 mBq/l for the 1 liter Lucas cell method and from 50 to 501mBq/l for the 145 ml Lucas cell method. The highest radium concentration values were found for samples from Nistru Gallery (510mBq/l, respectively, 501mBq/l) and Herja Gallery - Baia Mare (410 mBq/l, respectively, 463 mBq/l). The lowest values radium was determined for samples from Boului Gallery - Baia Sprie (20 mBq/l and 50 mBq/l) and Baiut Gallery (45 mBq/l, respectively, 50 mBq/l). The average obtained radium concentrations values are of 138 mBq/l for 11 Lucas cell method and 171 mBq/l for 145 ml Lucas cell method.
- 出版日期2013-5
