| Objectives: Get before running around in biological medium of radioactive 90 Sr and 137 Cs specific activity data, to evaluate or explain the plant during normal operation during and after the accident, the accident impact on the surrounding environment to provide sufficient background data. Environmental impact reports for the establishment of shandong haiyang nuclear power plant(loading phase) to provide supporting materials.Methods:(1) Choose the local representative of land plants and land animals and animal products, Marine biology and biological indicator for investigation object;(2) In nuclear power plant wind direction, frequency and gas way larger area, such as the eliminator area set the sampling point;(3) According to "technical specification for radiation environment "(HJ/T61-2001), biological samples collected on site in the harvest season,(4)Respectively, based on the biological sample 90 sr radiochemical analysis method in grey 2-(2- ethyl base) phosphate ester extraction chromatography "(GB 11222.1 89) and the gamma energy spectrum analysis method of radioactive nuclide in biological samples"(GB/T 16145-95) standard analysis in biological medium strontium- 90 and cesium- 137, corresponding measure instruments respectively BH1227 four-way low background alpha, beta, measuring instrument and Model 919 e HPGe multi-channel spectrometer;(5) Data processing and quality assurance technical specification for the radiation environment(HJ/T61-2001).Results:(1) In the samples of 6 kinds of land plants, different species of 90 Sr and 137 Cs content range of the mean respectively(0.04 to 1.78) Bq/kg and(0.02 to 0.26) Bq/kg(2)In 3 kinds of animal and animal products, different species of 90 Sr and 137 Cs content range of the mean respectively(0.02 to 2.95) Bq / kg(0.02 to 0.08) Bq / kg;(3) In four kinds of seafood, different species of 90 Sr and 137 Cs content range of the mean(0.02 to 0.24) and(0.02 to 0.18) Bq / kg;(4)In 4 kinds of indication of biological samples, different species of 90 Sr and 137 Cs content range of the mean respectively(0.05 to 5.25) Bq / kg(0.03 to 0.22 Bq / kg.Conclusions:(1) Land plants 90 Sr averages 0.21 Bq/kg, corn and peanuts 90 Sr content is low, forage and leek 90 Sr content significantly higher. Land plants 137 Cs averages 0.102 Bq/kg, forage and peanuts 137 Cs content is higher, wheat, corn and leek in the medium level.(2) animals and animal products 90 Sr averages 1.02 Bq/kg, 90 Sr content from low to high order for milk, pork and lamb. In animals and animal products of 137 Cs averages 0.050 Bq/kg, pork and mutton is a bit high, milk 137 Cs content is the lowest.(3) seafood 90 Sr averages 0.193 Bq/kg, Spanish mackerel 90 Sr content is low, squid, clam and mantis shrimp 90 Sr content is higher. A small amount of seafood detected 137 Cs, its average 0.083 Bq/kg.(4) biological indicator in 90 Sr averages 2.51 Bq/kg, 90 Sr content from low to high order as: oysters, enteromorpha, moss, and pine needles. Indicate biological sample averages 0.11 137 Cs Bq/kg, moss and enteromorpha 137 Cs content is higher, pine needles and oysters content is low. Land indicator organism pine needles and mosses, compared with other plant land 90 Sr content obviously on the high side, Marine biological indicator enteromorpha compared with other sea creatures 90 Sr content is definitely too high, too.(5) The survey, the 90 Sr and 137 Cs content in biological are not affected by the fukushima accident, because of the food chain and biological function is a long-term process, so to monitor the quality of biological environment to continue in the future. |
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