Correlation of Radiocesium Activity between Muscle and Peripheral Blood of Live Cattle Depending on Presence or Absence of Radiocontamination in Feed

Masatoshi Suzuki, Hidehiko Suzuki, Hirotoshi Ishiguro, Yosuke Saito, Satoshi Watanabe, Tomoyuki Kozutsumi, Yuichiro Sochi, Kiyoshi Nishi, Yusuke Urushihara, Yasushi Kino, Takashi Numabe, Tsutomu Sekine, Koichi Chida, Manabu Fukumoto

Research output: Contribution to journalArticle

Abstract

To monitor radiocesium activity in skeletal muscle of live cattle, the animals were given radiocesium-contaminated feed continuously, then switched to contamination-free feed after radiocecium concentration in peripheral blood (PB) reached plateau. Radioactivity in skeletal muscles of neck and rump was measured by attaching the probe of a NaI survey meter closely on the body surface just above the muscle of the live cattle (external measurement). We validated the strong positive correlation between the value of the external measurement and radiocesium activity concentration of dissected muscle (r = 0.89, P < 0.001 for neck; r = 0.80, P < 0.001 for rump). Accumulation of radiocesium both in muscle and PB was proportional to the total amount of radiocesium cattle ingested. However, radioactivity concentration in PB was constant in the cattle that had continuously ingested radiocesium, lower than 2.0 × 105 Bq in total within 67 days from the beginning of radiocesium intake. In addition, the ratio of radiocesium activity in muscle to that in PB was lower during the time when radiocontaminated feed was ingested than that of contamination-free feed ingestion. Using the correlation of radioactivity between muscle and PB, we confirmed that a majority of the cattle in the ex-evacuation zone of the Fukushima Daiichi nuclear power plant accident, from 167 to 365 days after the accident occurred, were in the declining period of radiocesium intake.

Original languageEnglish
Pages (from-to)589-601
Number of pages13
JournalRadiation Research
Volume192
Issue number6
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Biophysics
  • Radiation
  • Radiology Nuclear Medicine and imaging

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