@inproceedings{oai:repo.qst.go.jp:00054399,
 author = {Furuta, Etsuko and Minowa, Haruka and Nakahara, Hiromichi and Iwaoka, Kazuki and Yonehara, Hidenori and 岩岡 和輝 and 米原 英典},
 book = {Proceedings in Radiochemistry : A Supplement to Radiochimica Acta},
 month = {},
 note = {NORM means Naturally Occurring Radioactive
Material. Our object in this study is only consumer products
in several kinds of NORM. The existence of NORM in our
living-environment raises the radiation exposure dose of the
users. This has become a world-wide issue. The sources
of NORMs are mainly radionuclides in the thorium (Th)
and uranium (U) series. However, we have little published
information about the kinds of ores added to NORMs and
there are little indications on the NORMs'labels. It is wellknown
that Th and U usually exist with rare earth elements.
So we sought a classification method for identifying the kinds
of ores added to the consumer products from the correlation
of the concentration ratios of the Th/U and the Gd/Sm in
NORM and ores. The conventional r-ray spectrometry by
a Ge detector for analysis of Th and U and the prompt
gamma-ray activation analysis for the determination of Sm
and Gd were employed. It was found that the radiation
sources of NORM in the consumer products in recent markets
were mainly monazite. This classification method is found to
be useful to identify the ores used for the radiation sources in
consumer products of NORMs.},
 pages = {219--225},
 title = {Classification of ores used for the radiation source in NORM as consumer products by PGAA},
 volume = {1},
 year = {2011}
}