title: [Determinations of silicon and phosphorus in rice planted in a district of high incidence of amyotrophic lateral sclerosis by neutron activation and X-ray fluorescence analyses].
abstract: Silicon and phosphorus contents in polished and unpolished rice planted in a district of high incidence of amyotrophic lateral sclerosis (ALS) have been determined by neutron activation and X-ray fluorescence methods, and compared with those from control areas. In the neutron activation analysis, beta-ray spectra of 32P produced by the 31P(n, gamma)32P reaction on polished and unpolished rice were measured with a low background beta-ray spectrometer. In the X-ray fluorescence analysis, characteristic X-rays were analyzed with a wavelength dispersive X-ray fluorescence spectrometer. Silicon contents in polished and unpolished rice from the ALS area are 42 micrograms.g-1 and 370 micrograms.g-1, respectively, and the corresponding phosphorus contents are 1,210 micrograms.g-1, and 3,370 micrograms.g-1, respectively. The data for ALS area are equal to those for the control area within standard deviation.
authors.affiliation: Department of Nuclear Reactor Engineering, Kiniki University.
authors.forename: Y
authors.initials: Y
authors.lastname: Mizumoto
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
authors.forename: T
authors.initials: T
authors.lastname: Kusakabe
authors.forename: K
authors.initials: K
authors.lastname: Katsurayama
authors.forename: S
authors.initials: S
authors.lastname: Iwata
mesh_terms: D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology* / Q000209:etiology; D004032:Diet; D006801:Humans; D007564:Japan; D009501:Neutron Activation Analysis; D012275:Oryza / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012825:Silicon / Q000032:analysis*; D013052:Spectrometry, X-Ray Emission
chemical_list: D010758:Phosphorus; D012825:Silicon