Abstract
Dose rates of environmental radiation (r ray) were determined at hot spring areas in Sanin district, using a NaI (Tl) scintillation survey meter. Dose rates of radiation in the air of outdoors were higher at spa areas of Misasa, Sekigane and Ikeda which are known as radioactive springs than at non-spa area of Kurayoshi city.
A positive correlation between dose rates of radiation and Rn contents was shown in outdoor air at Misasa spa area.
Dose rates of radiation in outdoor air at Misasa and Sekigane tended to increase near the spring sources.
Dose rates of radiation in the air of the bathrooms were 30.1±9.0μR/h at Gunzehotel and 22.3±3.0μR/h at Ohashi-hotel-Gankutsunoyu at Misasa. They were very high, compared to those in the air outside the bathroom (11.8±2.3μR/h).
Dose rates of radiation in the spring water tended to higher in the brim of a bathtub. A few sinter deposits which contained radioactive elements were observed on the inside wall of a bathtub.
Count rates of radiation (cpm, α ray and β ray) on skin surface were determined after bathing in radioactive spring water of Misasa, using a ZnS (Ag) scintillation survey meter (α ray) and GM tube survey meter (β ray).
There were a good correlation between count rates of radiation (α ray and β ray) on skin surface and Rn contents in spring water.
