中村　公生・浜田　洋彦・田中　重雄

Radioactivity Monitoring Data in Miyazaki Prefecture (X VI)

Kimio NAKAMURA, Hirohiko HAMADA and Shigeo TANAKA

Abstract
In Miyazaki Prefecture, environmental and dietary radioactivity has been monitored since July 1998. This paper reports the radioactivity survey data from April 2003 to March 2004.

Grossβ radioactiivity in rain samples was N.D.-3.3Bq/L. Cesium-137 in greenteas and soils were measured at 0.99-2.8Bq/kg, and that in a full one day ordinary diet was measured at 0.041Bq/man・day byγ-ray spectrometry. The environmental radiation dose rate was 25.2-56.1nGy/h using a monitoring post, and 48-74nGy/h using a survey meter. There was no significant difference between the levels of the past years in Miyazaki Prefecture and those of other prefectures.

This radioactivity monitoring survey was consigned by the Ministry of Education,Culture, Sports, Science and Technology.

Key words : radioactivity, γ-ray spectrometry, grossβ

はじめに
本県内の平常時における環境放射能レベルについては、昭和63年度に当所に機器が配備されて以来、全国調査の一環として調査を続けているが、このたび平成15年度の調査を終了し、結果を取りまとめたので、その概要を報告する。