title: Free water 3H concentrations in serum samples collected during 1969-1992 in Akita, Japan.
abstract: The measurements for human and environmental samples from the 1960's and 1970's are important to understand the long-term transfer of 3H from the environment to the human body. The authors have previously reported 3H concentrations in diet samples collected in Akita Prefecture during 1969-1988. Serum samples from persons living in Akita Prefecture during 1969-1992 were recently obtained. The samples were originally gathered for medical examinations and stored in freezers at -20 degrees C. Composite samples from 100 persons on average were made for analysis. The free water 3H (FWT) concentrations in those samples were determined and compared with 3H concentrations in diet samples and precipitation. The long-term variation pattern of the FWT concentrations in the serum samples was similar to patterns in the diet samples and precipitation, but the FWT concentrations in the serum samples were slightly higher than those in the latter two. A single compartment model calculation showed that the apparent mean residence time of serum FWT was 1.4 y using precipitation as an input to the compartment.
authors.affiliation: Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho 039-3212, Japan. hisamatu@ies.or.jp
authors.forename: Shun'ichi
authors.initials: S
authors.lastname: Hisamatsu
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Inoue
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Hachiya
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Katoh
authors.forename: Toyoko
authors.initials: T
authors.lastname: Nakagomi
authors.forename: Osamu
authors.initials: O
authors.lastname: Nakagomi
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Motohashi
authors.forename: Yukio
authors.initials: Y
authors.lastname: Takizawa
mesh_terms: D000293:Adolescent; D002648:Child; D005507:Food Contamination, Radioactive / Q000032:analysis* / Q000706:statistics & numerical data; D006801:Humans; D007564:Japan; D011829:Radiation Dosage; D011847:Radioactive Fallout / Q000032:analysis* / Q000706:statistics & numerical data; D011874:Radiometry / Q000379:methods*; D011891:Rain; D019371:Topography, Medical / Q000379:methods; D014316:Tritium / Q000032:analysis / Q000097:blood*; D014878:Water Pollution, Radioactive / Q000032:analysis / Q000706:statistics & numerical data
chemical_list: D011847:Radioactive Fallout; D014316:Tritium