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生产磷肥的多种原料及肥料本身含有少量~(238)U,~(228)Th,~(226)Ra,~(210)Pb 和~(210)Po 等天然放射性核素。农业化学化速度的增长,业已成为土壤和农产品中天然放射性核素累积的一大因素,因而研究上述核素随着磷肥及其水溶液施入土壤后的活动以及向农产品的转移规律,乃是很有价值的。本研究的目的,是测定小麦植株对磷酸铵中~(226)Ra、~(210)Pb 和~(210)Po 的累积系数及其与土壤性质、磷酸铵施入深度、所施~(226)Ra 形态的关系。试验在盆栽条件下进行。四种供试土壤在性质上,特别是在腐植质和交换性 Ca 的含量及总吸收容量方面,有着明显差异(达6—7倍)。~(226)Ra 及其衰变子体~(210)Pb 和~(210)Po 标记的磷酸铵和上述核素的水溶液,于装盆时施入
Many kinds of raw materials and fertilizers for producing phosphate fertilizer themselves contain a small amount of natural radionuclides such as 238 U, 228 Th, 226 Ra, 210 Pb and 210 Po. The growth of agrochemicals has become a major factor in the accumulation of natural radionuclides in soils and agricultural products. Therefore, it is very important to study the above radionuclides’ activities following the application of phosphate fertilizers and their aqueous solutions to soils and their transfer to agricultural products valuable. The purpose of this study was to determine the accumulation coefficient of ~ (226) Ra, ~ (210) Pb and ~ (210) Po in wheat and its relationship with soil properties, ammonium phosphate application depth, ) Ra form of the relationship. The experiment was carried out under potting conditions. There was a significant difference (up to 6-7 times) in the nature of the four soils tested, especially in terms of humus and exchangeable Ca content and total absorption capacity. ~ (226) Ra and its decay progeny ~ (210) Pb and ~ (210) Po-labeled ammonium phosphate and the above nuclides were applied