Measurement Of Radionuclides And Heavy Metal Elements In Farmland In Tongliao Area

Agricultural fertilization has been identified as a potential cause of elevated levels of soil radionuclides and heavy metal elements,which can subsequently be absorbed by crops,animals,and humans,leading to an increased risk of various diseases and posing a significant threat to public health.Given that China is a significant agricultural producer,precise measurement of radionuclide and heavy metal content in agricultural soil,in addition to thorough research on their migration patterns and associated environmental and health risk assessments,holds great scientific and socio-economic significance.In this paper,the soil of the agronomy experimental field of Inner Mongolia University for Nationalities,the yellow corn field of Dalin Town and the red pepper field of Kailu were mainly used as the research objects,and the contents of radionuclides and heavy metal elements in the soil were collected and analyzed through sample layout.YH3324 four-way low backgroundαβspectrometer and ultra-low background high purity germanium detector were used to measure and analyze the totalα,specific activity of totalβ,²³⁸U,²³²Th,²²⁶Ra,⁴⁰K,¹³⁷Cs nuclides and environmental radioactivity levels in soil.At the same time,the elemental content of Pb,Cd,Cr and Cu in soil was determined by AAS6810 atomic spectrophotometer.The dose contribution of radionuclides and heavy metal elements to surrounding residents was calculated by using the air absorption dose,effective dose,radium equivalent activity andγexternal exposure hazard factors proposed by the United Nations Science and Technology Commission.According to the US Environmental Protection Agency’s risk assessment guidelines,carcinogenic and non-carcinogenic effects are discussed separately,and health risks to the public are assessed.The risk assessment of heavy metal pollution and its potential ecology was carried out by using the pollution load index method,the pollution load index method and the Hakanson index model.The results showed that the specific activity of ²³⁸U,²²⁶Ra,²³²Th and ¹³⁷Cs in farmland soil samples was lower than the average of China,the world and Inner Mongolia,and the totalαwas also smaller than that of other regions,indicating that the use of phosphate fertilizer did not cause radioactive pollution of ²³⁸U,²²⁶Ra and ²³²Th,nor did it lead to an increase in the totalαradioactivity level.The specific activity of ⁴⁰K was higher than the average of China and the world,and the totalβradioactivity level was also high,among which the totalβradioactivity level of Kailu red pepper field was the highest,and the potassium fertilizer applied during the planting process of Kailu red pepper field was higher than that in other areas,indicating that the application of potassium fertilizer was the main reason affecting the totalβradioactivity level.However,the specific activity of 40K was lower than the average in Inner Mongolia,indicating that the local pollution of 40K was within the regional control range and did not cause harm.The annual effective dose ofγexternal radiation was much less than the average annual effective dose rate of2.5 m Sv of the world population,and the radium equivalent activity concentration and external radiation hazard index did not exceed the maximum limit of 370 Bq/kg and 1,indicating that radionuclides and heavy metal elements in soil did not cause radiation dose hazard,and there was no significant risk of no carcinogenic effect.The concentration of heavy metals in the soil in the farmland area met the soil environmental quality standards,the soil accumulation degree was low,the impact of human activities on heavy metal pollution was small,and no potential ecological risks were found.