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Radon Concentration in Air and Water and Tentative Dose
Estimation in A Hot Spring Hotel of Gifu PrefectureMichikuni SHIMO+, Shino OYAIZU+, Shinji TOKONAMI,, Kaori KITAMURA+,
Kazutaka EJIRI+ and Kazuyuki MINAMI+,+
Fujita Health University, School of Health Sciences
Radon Research Group, National Institute of Radiological Sciences

Abstract
Measurement of radon concentration in indoor air and in spring water and bath was
performed in a hot-spring hotel to estimate the human dose due to radon decay products.
Radon concentration was -*ῌ1/ Bq/m- for indoor air, -/** Bq/L for spring water and ,0*
Bq/L for bath water. The tentative diurnal dose was estimated from calculation to
become /.- mSv for staying person and ..+ mSv for hotel stu#, respectively. The tentative
annual dose was calculated from the diurnal dose to become 0* mSv for staying person
and ,.2 mSv for hotel stu#, respectively. These estimated doses are about , times higher
comparing with world mean dose due to natural radon. It is concluded that these values
are able to be ignored for consideration of human health.
Key words : Hot-spring hotel, Radon concentration, Indoor air, Hot-spring water, Tentative dose estimation;< : =>?@ AB CDEF =>G HIJ

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Radon concentration in indoor air.

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180
Table +

Radon concentration in spring water and bath water

Spring water & bath water

Rn in Bq/L

Ref4 Spring water Rn in Bq/L

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181

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Table ,

183

Parameters and diurnal dose and total diurnal dose(a) Stay person

Diurnal
Dose conversion
occupancy
factortime[mSv/(Bq h mk-)][h]
3l+*k03l+*k03l+*k03l+*k03l+*k03l+*k0

Guest RM
Dining RM
Dressing RM
Bath RM
Outdoor(sum)

F value[k]

Radonconcentration
in indoor air[Bq/m-]

Diurnaldose[ mSv]

*4.
*4.
*4.
*4.
*4/
m

/-n+*
/3n 2
/.n 3
/.n 3
04m

,41n*4/*4.n*4*0+4*n*4,+4*n*4,*4+2/4-n*40

F value[k]

Radonconcentration
in indoor air[Bq/m-]

Diurnaldose[ mSv]

*4.
*4.
*4.
*4.
*4/
m

/-n+*
/3n 2
/.n 3
/.n 3
04m

,4*n*4.
+41n*4,*4,n*4**4+n*4*,*4++.4+n*4.

+.4/
,4*
*4/
*4/
04/
,.
(b) Hotel stu#

Diurnal
Dose conversion
occupancy
factortime[mSv/(Bq h mk-)][h]
3l+*k03l+*k03l+*k03l+*k03l+*k03l+*k0

Guest RM
Dining RM
Dressing RM
Bath RM
Outdoor(sum)

Table Case

Diurnal dose due to radon emanated from bath waterRadon content in
Dose [ mSv]
bathtub [Bq/L](+)(,)
Mean of (+) and (,)



+*4/
24*
+4*
*4/
.4*
,.

+/*
-0
,0*

 

Remarks(values of factor in Eq4 (+) and (,))
Po+*k., Ko3l+*k0, To*4/, Fo*4.
Po+*k., Ko3l+*k0, To*4/, Fo*4.
Po+*k., Ko3l+*k0, To*4/, Fo*4.

*4*,1
*4*00
*4*.0

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184
Table . Dose due to radon
Stay person
140 mSv
Rn in airRn in water
Drinking

Diurnal dose

Annual dose

.4+ mSv+4, mSv+4/ mSv*4.- mSv(used for upper column)
Indoor : +/40 Bq/mOutdoor : 04- Bq/mIndoor : 1*** hOutdoor : +10* h

Rn concentration in Japan
Annual occupation time
(UNSCEAR,**+)



Mean value in Japan

/4.
*4*.0
,4,

*40 mSv : - months stay
,42 mSv : one year stay 

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9 ZZAB012yI9F

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F

185

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Board on Radiation E#ects Research (BRER ; +333) : Risk Assessment of Radon in Drinking
Water, CLS/NRC Report, National academy Press.

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Sanada, T., Fujimoto, K., Miyano, K., Doi, M., Tokonami, S., Uesugi, M. and Takata, Y. (+333) :Measurement of Nationwide Indoor Radon Concentration in Japan, J. Env. Radioact., ./,+,3ῌ+-1.

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Shimo, M., Sugino, M. and Hatano, H. (,**-) : Measurements of Radon Concentration in Waterof Campus, Dormitory and Student Home in South area of Gifu Prefecture and Northwest
area of Aichi Prefecture, J. Journ Health Phys. -2 (-), ,0+ῌ,00.

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 !"  #$ ,**. : %&'()*+,-. Proc. / Workshop on Environmental Radioactivity, Ed. Miura T., 20ῌ3-.
thTokonami, S., Zhuo, W., Ryuo, H., Yonehara, H., Yamada, Y. and Shimo, M. (,**-) : Instrument
Performance of A Radon Measuring System with The Alpha Track Detection Technique,
Radiat. Prot. Dosim. +*-, 03ῌ1,.
Tokonami, S., Sun, Q., Akiba, S., Zhuo, W., Furukawa, M., Ishikawa, T., Hou, C., Zhang, S.,
Narazaki, Y., Ohji, B., Yonehara, H. and Yamada, Y. (,**.) : Radon and Thoron Exposure
for Cave Residents in Shanxi and Shaanxi Provinces, Radiat. Res., +0,, -3*ῌ-30.
Yamasaki, T., Guo, Q. and Iida, T. (+33/) : Distributions of thoron Progeny Concentration in
Dwelling, Radiat.Prot. Dosim. /3, +-/ῌ+.*.

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Zhuo, W., Tokonami, S., Yonehara, H. and Yamada, Y. (,**,) : A Simple Passive Monitor for
Integrating Measurements of Indoor Thoron Concentration, Rev. Sci. Instrum., 1- (2), ,211ῌ
,22+.

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