@inproceedings{oai:repo.qst.go.jp:00053663,
 author = {Tagami, Keiko and Uchida, Shigeo and Takeda, Hiroshi and 田上 恵子 and 内田 滋夫 and 武田 洋},
 book = {Waste Management Symposium Proceedings},
 month = {Jun},
 note = {In this study, estimation of excess amount of uranium in Japanese agricultural soils due to phosphatic fertilizer application were carried out, by measuring concentrations of total U and Th in 82 soils collected throughout Japan by inductively coupled plasma mass spectrometry (ICP-MS). Since Japanese non-agricultural fields has an average U/Th ratio of 0.23, thus, using U/Th ratios in non-agricultural areas, we thought that it is possible to calculate amounts of excess U due to the application of fertilizers. It was estimated that about 50% of total U in paddy field soils (range: 4-78%) and about 48% of total U in upland field soils (range: 4-74%) were originated from the phosphatic fertilizers.},
 title = {Estimation of anthropogenic uranium concentration in Japanese agricultural soils from phosphatic fertilizers},
 volume = {32},
 year = {2006}
}