The Water Environment Radioactive Survey Of Ccentralized Drinking Water Sources In Suzhou City

Objectives： To assess the radioactive level of water sediment and soil samplesfrom Tai lake, and the water from waterworks and residents living water inmunicipalities in Suzhou city, Jiangsu province, P.R. China.Methods： Water, sediment and soil samples were collected from three differentsources of Suzhou in Feb,2010; May2010;Aug,2010;Nov,2010.1. The γ dose rate level of Water sources was measured by Radiation SurveyMeter(FH⁴⁰G,FHZ672E-10Probe, America).2. The totals of α and β was measured by two-sample low-background α and βscintillation counter.3. Use BE5350（CANBERRA Company） γ nuclide to measure the¹³⁷Cs and²²⁶Ra、²³²Th、⁴⁰K in the Aquatic of Water sources.4. Use919E ORTEC γ nuclide to measure the¹³⁷Cs and²²⁶Ra、²³²Th、⁴⁰K in theSediment and Soil.Results:1. Among three different water sources, the highest level of γ dose rate was110.0nSv/h,the lowest level was51.6nSv/h, the mean was84.62nSv/h.2. Among all the source water, the highest level of α was0.033Bq/L,the lowestlevel less than the lower limit of instrument0.0146Bq/L, the mean was0.024Bq/L; Thehighest level of β was0.247Bq/L, the lowest level was0.095Bq/L, the mean was0.187Bq/L.Among all the drinking water, the highest level of α was0.021Bq/L,the lowestlevel less than the lower limit of instrument0.0146Bq/L, the mean was0.018Bq/L; Thehighest level of β was0.192Bq/L, the lowest level was0.091Bq/L, the mean was0.151Bq/L.among Drinking water, the highest level of α and β was0.021Bq/L and0.192Bq/L.3. Among the aquatic plants of water sources, the highest level of²³²Th was 2.65Bq/Kg, the lowest level was0.30Bq/Kg, the mean was1.44Bq/Kg; The highestlevel of²²⁶Ra was2.45Bq/Kg, the lowest level was0.27Bq/Kg, the mean was1.32Bq/Kg;The highest level of⁴⁰K was358.4Bq/Kg, the lowest level was57.31Bq/Kg,the mean was147.4Bq/Kg; The highest level of¹³⁷Cs was0.15Bq/Kg, the lowest levelwas0.04Bq/Kg, the mean was0.083Bq/Kg.4. Among the Sediment and Soil of Water sources, the highest level of²³²Th was43.72Bq/Kg, the lowest level was1.70Bq/Kg, the mean was25.65Bq/Kg;The highestlevel of²²⁶Ra was34.79Bq/Kg, the lowest level was2.52Bq/Kg, the mean was19.06Bq/Kg; The highest level of⁴⁰K was440.0Bq/Kg, the lowest level was16.61Bq/Kg, the mean was244.88Bq/Kg; The highest level of¹³⁷Cs was3.68Bq/Kg, thelowest level was0.30Bq/Kg, the mean was1.58Bq/Kg.Conclusions: Radioactive levels of both drinking water and the surroundingenvironment of water source in Suzhou city meet national safety standards.