INDOOR-ATMOSPHERIC RADON-RELATED RADIOACTIVITY AFFECTED BY A CHANGE OF VENTILATION STRATEGY

[Original Article]

INDOOR-ATMOSPHERIC RADON-RELATED RADIOACTIVITY
AFFECTED BY A CHANGE OF VENTILATION STRATEGY

TSUNEO KOBAYASHI

Department of Physics, Fukushima Medical University School of Medicine,
Fukushima, 960-1295, Japan

(Received April 14, 2006, accepted May 18, 2006)

Abstract: Abstract : The present author has kept observation for concentrations of atmospheric radon, radon progeny and thoron progeny for several years at the campus of Fukushima Medical University. Accidentally, in the midst of an observation term, i.e., February 2005, the facility management group of the university changed a strategy for the manner of ventilation, probably because of a recession: (I) tidy everyday ventilation of 7:30-24:00 into (II) shortened weekday ventilation of 8:00-21:00 with weekend halts. This change of ventilation manner brought a clear alteration for the concentrations of radon-related natural radioactivity in indoor air. The present paper concerns an investigation of the effect of the ventilation strategy on the indoor-atmospheric radon-related radioactivity.

Key words: radon, radon progeny, thoron, indoor air, ventilation

擣林抉夫

Correspondence to: Tsuneo Kobayashi, Department of Physics, Fukushima Medical University, Fukushima City 960-1295, Japan.
E-mail: tkoba@fmu.ac.jp