Radon concentration in drinking water and supplementary exposure from South-East of Transylvania, Romania,

K, Szacsvai [Szacsvai, Kinga (Környezetfizika, ...), szerző]; T, Néda; Sz, Poszet; A, Szakács

Angol nyelvű Tudományos Absztrakt / Kivonat (Könyvrészlet)
    Azonosítók
    • MTMT: 3012455
    Radon concentration in drinking water and supplementary exposure from South-East of Transylvania, Romania Kinga Szacsvai, Tamas Neda, Szilard Poszet, Alexandru Szakacs Sapientia Hungarian University of Transylvania, Faculty of Sciences and Arts, Cluj-Napoca, Romania From the public health point of view, the investigation of the radon and radium content of drinking and mineral waters and the estimation of their contribution to the radiation exposure are our current tasks now days. Radon is an inert radioactive gas whose concentrations in ground water are reportedly related to a number of factors including emission of radon from surrounding rocks, temperature, pressure, and rainfall and earthquake activities. Generally, higher radon concentration is observed in waters of low mineralization. Also, the radon activity decreases with the depth of the area where the water circulates. When water containing radon is used in the home for showering, washing dishes, and cooking, radon gas escapes from the water into the air. The aim of this work is to measure the radon concentration of drinking well waters and calculated the effective dose per year. The places where we measured it was in 94 location in South-East of Transylvania (Brasov, Covasna and Mures county). In the present study, the measurements of radon were carried out using the LUK-VR system based on radon gas measurements with Lucas cells. The LUK-VR system consists of a LUK-3A device and a VR scrubber dedicated for radon measurements in water samples. The VR-scrubber consists of a glass vessel of 500ml volume where a known quantity of water sample (300ml) is introduced. The principle of operation is that the concentration of the radon dissolved in the water sample is mixed with the air that is on the top of the water level; within the scrubber volume. Following this, air is then transferred from the scrubber to be measured for radon using the Lucas cell method. Concentrations of the radon were determined in 165 selected well water samples of this region of Romania. The results showed radon concentrations within the range of 0.1 – 10.02 Bq/l with an average value of 1.89 Bq/l. The use of the water can be one of the factors that increase the indoor radon concentration. At the same time drinking of radon rich waters can contribute to the internal irradiation. For this reason is important to control the radon activity concentration of waters. The corresponding annual effective ingestion dose due to radon from water was determined from drinking water used (1l/person/day) by the population inhabiting the area. For the dose conversion factor the 3.5·10-9 Sv/Bq value has been used, proposed by UNSCEAR and adopted by the European Community too. The calculated annual effective dose from radon was located between 0.128-10.02 μSv/year. The radon measurements were performed using the Lucas cell method with short counting time during the non-equilibrium state between radon and its progeny. The short counting time allowed the large number of water samples to be measured fast, so to avoid delays within the survey program. In most of cases, the measured values are not high and do not exceed the radioprotection standards recommended by national and international institutions (US, EPA).
    Hivatkozás stílusok: IEEEACMAPAChicagoHarvardCSLMásolásNyomtatás
    2022-01-25 05:15