na-cl ˘ˇˆ˙˝˛˚˜ ! #$ raj-hss.org/journal/back_number/vol58_pdf/vol58no4_241_255.pdfˇˆ ˙...

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膓腮膀腚膠腚膔 膓腮腥膓腮腯腨膕 膏膂 膗腸 膗腸 膋腳膠 腠膁膀腚 腛膋膚腙腒腛腟腤腞腉腎腊腃膆腍腋腌膘腲膍腱腦腰腻 腺腼腥膍膐腯膡腜膅腈 腠膁腚腔膀腚膐腴膖腖腚膔 腺腼腥腠膁腯膛膅 腪膉膀腚腧膎膘腲腾腐腗腚腤腞腶 腪膉腥腪膉腯膊腡腘 膄膝 腆腀 腕腽腗腚 膓膈腵膗 腬膃 膜腢腓 腭腩 腑腷膙膒 膑膉膞膇 腮膚腹腝 腙腚腔腏腑腞腎 腝腗腠腒腖腍腃腆腢腆腇腄 腐腕腛腘腟腅腋腉腈腊 腡腌腜 Abstract 241 Faculty of Science, Toyama University, OMITA ATAKE ASAKI AKAGUCHI NOUE AMAJIMA AMAMOTO stitute for Radiation Biology and Medicine, Hiroshima University, Kasumi, Minami-ku, Hiroshima Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake, Nomi, Ishikawa , Japan. Gofuku, Toyama , Japan. Faculty of Fine Arts and Infor- matics, Kanazawa Gakuin University, Sue, Kanazawa, Ishikawa , Japan. Research In- , Japan. J. Hot Spring Sci. Radium isotope ( Ra and Ra) in twenty three Na-Cl type saline waters obtained from deep wells around the coastal area of Ishikawa Prefecture, Japan, were measured along with U isotope ( U and U), major chemical components and hydrogen and oxy- gen isotope ratios. The waters sampled were the mixture of local meteoric water and seawater, including fossil seawater in origin from the relationship among D, O and Cl and chemical composition. The Ra concentrations in water samples varied in the wide range from . mBq/kg, and occurrence of saline waters having high concentra- tions over mBq/kg was confirmed in some of them. The Ra concentrations showed a trend increasing with the increase of TDS in the water samples. The Ra/ Ra activity ratios ( . . ) of water samples were comparable to or slightly higher compared with Th/ U activity ratios of common rocks in Japan. The U concentrations of water Junpei T , Hiroshi S , Keiichi S , Aya S , Mutsuo I , Yasunori H and Masayoshi Y Radium Isotope in Na-Cl Type Saline Waters from Deep Wells around Coastal Area in Ishikawa Prefecture, Japan Na-Cl Ra + + , , - - . . ,,0 ,,2 ,-2 ,-. +2 ,,0 ,,0 ,,2 ,,0 ,-, ,-2 ,-2 + , - . + + + + , - . + + + 3-* 2/// -+3* ,* +, ,, ,+ , +3 3,- +,,. ,. 3,- +,,. 3-* 2/// 3,* +-3, +* 3,* +-3, 1-. 2//- + , - 1-. 2//- /2 ,.+ ,// ,**3 + 12 ,+.- -1* * 2- .3 d d

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Page 1: Na-Cl ˘ˇˆ˙˝˛˚˜ ! #$ Raj-hss.org/journal/back_number/vol58_pdf/vol58no4_241_255.pdfˇˆ ˙ ˝˛˚˙˜ !"#$%&’()*+,-./0 12,3 4567 ˇˆ 8 39:; 12 ˇˆ  ?@*+ABC!D

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Abstract

241

Faculty of Science, Toyama University,

OMITA ATAKE ASAKI AKAGUCHI

NOUE AMAJIMA AMAMOTO

stitute for Radiation Biology and Medicine, Hiroshima University, Kasumi, Minami-ku, Hiroshima

Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology,

Kanazawa University, Wake, Nomi, Ishikawa , Japan.

Gofuku, Toyama , Japan.

Faculty of Fine Arts and Infor-

matics, Kanazawa Gakuin University, Sue, Kanazawa, Ishikawa , Japan.

Research In-

, Japan.

J. Hot Spring Sci.

Radium isotope ( Ra and Ra) in twenty three Na-Cl type saline waters obtained

from deep wells around the coastal area of Ishikawa Prefecture, Japan, were measured

along with U isotope ( U and U), major chemical components and hydrogen and oxy-

gen isotope ratios. The waters sampled were the mixture of local meteoric water and

seawater, including fossil seawater in origin from the relationship among D, O and Cl

and chemical composition. The Ra concentrations in water samples varied in the wide

range from . mBq/kg, and occurrence of saline waters having high concentra-

tions over mBq/kg was confirmed in some of them. The Ra concentrations showed

a trend increasing with the increase of TDS in the water samples. The Ra/ Ra activity

ratios ( . . ) of water samples were comparable to or slightly higher compared with

Th/ U activity ratios of common rocks in Japan. The U concentrations of water

Junpei T , Hiroshi S , Keiichi S , Aya S ,

Mutsuo I , Yasunori H and Masayoshi Y

Radium Isotope in Na-Cl Type Saline Waters

from Deep Wells around Coastal Area in

Ishikawa Prefecture, Japan

Na-Cl

Ra

+

+

, ,

- -

. .

,,0 ,,2

,-2 ,-.

+2

,,0

,,0

,,2 ,,0

,-, ,-2 ,-2

+ , - .

+ + +

+ , - .

+ + +

3-* 2/// -+3*

,* +, ,, ,+ , +3

3,- +,,.,.

3,- +,,.

3-* 2///3,* +-3, +*

3,* +-3,1-. 2//- + , -

1-. 2//-

/2 ,.+ ,// ,**3

+ 12 ,+.--1*

* 2- . 3

d d

Page 2: Na-Cl ˘ˇˆ˙˝˛˚˜ ! #$ Raj-hss.org/journal/back_number/vol58_pdf/vol58no4_241_255.pdfˇˆ ˙ ˝˛˚˙˜ !"#$%&’()*+,-./0 12,3 4567 ˇˆ 8 39:; 12 ˇˆ  ?@*+ABC!D

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242

Radium isotope, Na-Cl type saline spring water, Deep well, Coastal area, Ishikawa

Prefecture

samples were extremely low ranging from less than detectable to . mBq/kg. These

findings suggest that the main processes for supplying Ra isotope to water were probably

not by rock dissolution but by both -recoil from Th isotopes and desorption reaction of

Ra isotopes from water-rock interface.

Key words :

Na-Cl

Ra Ra, Ra U U, U

D O D- O-Cl

Na-Cl

Ra . mBq kg Ra

Ra Ra . .

Th U

U . mBq kg

Ra Th

Th Ra

: Na-Cl

U Ra : y Th Ra . y

Ra . d U Ra . d Ra

Ra

Clark and Turekian,

Ra Rn

Nakai, ; Ra

; Kanai, Ra : .

Bq kg ; Ra : . Bq L ; Kanai,

Ra : . Bq L ;

Ra : Bq L ; Behounek

Ra : Bq kg ; Sturchio

Ra : Bq L ; Kraemer and Reid,

Ra : Bq L ; Moise

Ra

Ra Kraemer and Reid, ;

Sturchio

Na-Cl

Ra

et al.,

et al.,

et al.,

et al.,

,,0 ,,2 ,-2 ,-.

+2 +2

,,0 ,,0

,,2 ,,0

,-, ,-2

,-2

,-2 ,,0 ,-, ,,2

,,. ,-/ ,,-

,,,

,,0

,,0

,,0

,,0

,,0

,,0

,,0

,,0

,,0

,,0

, *.

,-

+ 12 ,+.-* 2- . 3*

, *.

+0** / 1/

- 00 ++ .- .

+33*

+3.* +313

+3// +322 0 ,

+3// + . +322

* // +3//

,1 +3-/

+,2 ,**+

/2 +32.

+, ,***

+32.

,**+

,**1

+

a

d d d d

a a

��

��

� ��

��

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Page 3: Na-Cl ˘ˇˆ˙˝˛˚˜ ! #$ Raj-hss.org/journal/back_number/vol58_pdf/vol58no4_241_255.pdfˇˆ ˙ ˝˛˚˙˜ !"#$%&’()*+,-./0 12,3 4567 ˇˆ 8 39:; 12 ˇˆ  ?@*+ABC!D

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Fig. (a) Geological map of Ishikawa Prefecture, Japan, with sampling sites of Na-Cl type saline waters and

river waters, and (b) geological cross-section at six lines (A-F). These maps were compiled based on

Kaseno ( ) and Ohwada ( ).et al.

243

Na-Cl Ra

Ra

Na-Cl Ra

Na-Cl

Ra

Ra mg kg Ra

mBq kg

Na-Cl Ra Ra

Ra Ra Ra

Fig. a Fig. b

Fig. a

Fig. b

+

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,,0

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Fig. a , m

Table

L

pH

L Ra U

pH U Fe

pH Ba Ba :

mg NH SO

Ra U BaSO Fe OH

BaSO Fe OH Fe OH

BaSO U BaSO

Ge

Ra Ra Ra

Ge Hamajima

and Komura, NBL No. . -U No. . -

Th KCl Ra Ra keV Pb

keV Pb keV Bi keV Ac keV Ac

Ra Pb Bi Rn Ra

Saito Ra

keV Ra Rn

Ra BaSO Ba

Ra Yamamoto ; Inoue and Komura,

Ra Ba NO Ra : . . mBq g-Ba, Ra :

Barite, Ra : . . mBq/g-Ba, Ra : . . mBq/g-Ba, Inoue and

Komura, Na CO Ba

U

HF, HNO HClO N HCl

Fe U

U Si

U U

. . . . mBq U U

D O

Micro Mass Prism

model Ohsumi and Fujino, ; Epstein and Mayeda,

V-SMOW D O

.

Li , Na , K , Mg , Ca , Cl , Br , SO

et al.,

et al.,

,-, -

, ,

. , .

. -

. - -

. .

,,0 ,,2

,,0 ,,2 ,+.

,+. ,+. ,,2 ,,2

,,0 ,+. ,+. ,,0

,,0

,,0

.

,,0 ,,2- ,

,,0 ,,2

,, -

- .

,-2 ,-.

,-2 ,-.

+2

+2

, , ,.

+ + ***

+

/

,* -*

,*

+ ,

,

.3, ,

0**

,**. ., + . *. 13 + *+

,3/

-/, 0*3 --2 3++

,**,

+20

+323 ,**1

1 0 , *

* 1 * + * , * +

,**1

+*

* +.- * *.2 * +02 * */+

-

+320 +3/-

, * +

, ,

g

a

d d

d d d

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Table Chemical and isotopic compositions of Na-Cl type saline waters and river waters

245

n.a. n.d. n.d.

n.d. n.d.

n.a.

n.a. n.d. n.d.

n.d. n.d.

n.d. n.d.

Well Li Na K Mg Ca Cl Br SO Alkalinity D O Balance*Sampling

No. depth pHdate

(m) (mg/kg) (meq/L) ( ) ( )

Na-Cl type saline water

a

b

a

b

n.d.*

n.d.

n.d.

a

b n.a.* n.a.

River water

R

R

R

R

R

Sea water* *

* : Cation/anion balance ( cation anion)/( cation anion) in meq L . Density of water was assumed to be

equal to unity in this calculation.

* : The data set was referred from Isshiki ( ).

* : The concentrations of carbon species (HCO , CO , CO ) were expressed in mM.

* : “n.d.” denotes “not detected”.

* : “n.a.” denotes “not analyzed”.

Na-Cl Ra

Dionex ICS- . M HCl

Na-Cl pH, D O Table

pH . .

cation anion cation anion in meq L

Na-Cl

+

+2 +.

.

/

, -

+ +

,

- ,- - ,

.

/

+2

+

,1 1 ,**/

+1 . ,**0

,1 1 ,**/

+1 . ,**0

+ 2 ,**/

+ 2 ,**/

,3 1 ,**/

,3 1 ,**/

+ 0 ,**1

+ 0 ,**1

+ 0 ,**1

+ 0 ,**1

2 0 ,**1

2 0 ,**1

0 0 ,**1

0 0 ,**1

0 0 ,**1

0 0 ,**1

0 0 ,**1

0 0 ,**1

1 0 ,**1

1 0 ,**1

1 0 ,**1

1 0 ,**1

1 0 ,**1

-* + ,**2

1 0 ,**1

2 0 ,**1

0 0 ,**1

0 0 ,**1

+2 +* ,**/

+. ++ ,**/

14* *4/- 1,4* ,241 ++3. ,14,

043 *4// 1,4- -+41 ++2* ,14.

14+ *4,* ,34- ,+4/ 12. +24/

14- *4+2 ,34* +242 102 +342

140 *4,2 3/4+ 34++ ,-, ++40

043 +4.- 124* .4,, ,+++ ,24+

14* *4,+ +*. ,*4, ,+/ +-4.

14/ *4+- +-. 04+/ 104+ +/4/

14- *4/* ,*- 242- +,2 ,,42

140 +4+0 +2* +.4. 1.4/ +.4/

14, *4*1 .34/ 1243 ,-+ 04/0

14+ ,4** 1.40 /.41 +-2 ,14,

143 *4*/ 1-4/ 3/4* /241 ++42

141 *412 114/ --4, +*. +-4-

14, ,4+0 +./ +-41 /.4/ +-4.

140 +41, ++* +,* 323 ,.4,

14+ *4*, -04, +.* ++3 14/,

24+ *4+. +.4. *403 +3.3 ,14-

14/ *4+, +*/ ,31 .1/ ,,4*

140 *4*, +243 ,-4, +/4/ +402

14+ +4*1 -*40 0*4, +,++ .+4/

040 *4.0 ,3/ .-2 /.0 .-4/

14* *4+0 ,,2 3*3 +**. /*4-

14. 240- +-, +,40 ,1*- -/4,

043 ++40 +,2 -*4* --33 ./41

14* ++4/ +,3 -*4. --,, ..4-

+4,1 ,43+ 04+-

14- +43* ,4,3 04--

*4*+ .4/- -4// 14-+ *4+0

,4,* ,4+/ -42*

14* *423 ,40. +.42

143 *43- ,42/ +04+

*4+2 -3+ +--1 ..+ 0241

+ +,** ./,2 2/-2 3-1 *403 -.42 /40 *4+

+ ./01 2-., 3/* *403 -.4* 04* +4,

, +,** -.31 /1-+ +,0. *401 .+43 04/ +4-

, -.2+ /1++ +,1. *401 .*4- 040 *43

- 2** ,,33 --1, 0*3 *432 /+4. 14/ ,40

. +,* --+3 2/.0 ,/2 *4.2 -34- 04/ +4*

/ +*** ,.-1 -23. -41* ,4.- /+4. 143 -41

0 +-** ,3.1 .0/, ,4.3 .40- .34- 14/ *4+

1 ++0* -311 0*1+ 24-0 -340 14* +4/

2 +/** ,-22 --/0 +04, /+4+ 240 +4+

3 3** +,02 ,-2+ ,0. ,4** .24* 24- *4,

+* +*** -10+ /2*1 ,43+ +-4* -34. 04- *4*

++ +,** ,-*0 -.-- .12 ,4,. .14+ 14- +41

+, +-** ,.+1 --2, ,,43 +.41 .04- 14/ ,4*

+- +*** +3** ,+./ -*4. /,42 24. *4-

+. +/** -2.1 1-/2 0-- -4// -041 04/ +4+

+/ +**+ ++22 ,,-2 ,0* *43/ .+4+ 14+ *4-

+0 +,./ -1., 2./0 0,3 *4-2 +040 /40 +40

+1 +001 -03* 0.3- 0.+ -42, -14* 04- ,40

+2 /** ,3+ -.+ 0*4* -423 /-43 34* -4/

+3 +*** 10-2 +-+/+ +++1 *42* +-42 .4. *4.

,* +/** 2,33 +.*12 +++1 +4.1 34/ ,40 +4+

,+ +,** 2*03 +/.,3 +0-+ +4*- ++4, ,40 +4,

,, ,** .*** +*231 +/. *4-* ,+40 /4* *4/

,- +/** .3*3 +-02/ .+4, *4,1 +-4+ .41 *4.

,- .131 +-.3. .,4, *4.* *4+

+ ++43 ++4, -401 *4/. ./4* 24. 24+

, +-4. +-42 .4*/ *4/, ..4. 24+ 04/

- .+40 -+43 ,*4. +4,/ .042 24* *4+

. +-4, +-4* /42/ *4.0 .24. 24- ,4.

/ 04-3 /4+. +,4, *40. 0+42 342 34,

0433 04*/ +/4/ *413 0,42 +*4+ -4,

++*-/ +32/. ,120 , ,4.

,**/

/2 ,**3

+*** * +

+

0 0 2 +

+*

- +

-

d d

d d

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Fig. The plots of (a) D- O, (b) D-Cl and (c) O-Cl for Na-Cl type saline waters obtained from coastal

area in Ishikawa Prefecture, Japan. Gray solid circle ( ) shows SMOW (Standard Mean Ocean Water).

The solid and dashed lines in Fig. (a) show LMWL (Local Meteoric Water Line, D O ) and

GMWL (Global Meteoric Water Line, D O ), respectively. Dashed lines in Fig. (b) show mixing

lines of seawater and local meteoric waters.

246

Total Dissolved Solid, TDS ; g kg

Na-Cl D O . .

D O . . Fig. a

D- O D O GMWL

Craig, GMWL

; Mizota and Kusakabe,

LMWL : D O Mizota and Kusakabe,

; D O

D-Cl Fig. b O-Cl Fig. c

No. Cl

Fig. a

; Brumsack

Fig. a Fig. b Br-Cl SO -Clet al.,

+2 +2

+2

+2

,

, 2 ,*2 +* ,

+2

+2

+2 +2

+2

+2

+2

.

+ ,1

/. +* 3 * , 0

0- .. +* + 2 * ,

2 +*

+30+

+32- +33.

2 ,*

+33. +331

, ,

+0 +3 ,, ,-

,

+320 ,***

+33, - -

d d d d

d d

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d d

d d

d d d d

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Fig. The plots of the relation of (a) Br-Cl and (b) SO -Cl

247

Na-Cl Ra

Cl Br

Cl Br

Fig. a Br Cl

. Cl Br

SO Cl . Fig. b

Yamanaka

and Kumagai,

Ra Ra, Ra U U, U Table

Table Ra Ra

. mBq kg . mBq kg

Ra mBq kg Fig. a

Ra : mBq L ; Kanai., Ra : mBq L ;

Ra : mBq L ; Nakano-Ohta and Sato, Ra :

mBq L ; Fig. a

Ra

Ra Ra . .

Ra Ra . . ; Nakano-Ohta and Sato,

Fig. b Ra

Th U Ra Ra

. . . . Miyake Fig. b No.

m m U Th

Th U . . . . No.

Ra Ra . Th U

et al.,

Ra Ra, Ra U U, U

.-

.

,,0 ,,2 ,-2 ,-.

,,0 ,,2

,,0

,,0 ,,0

,,0 ,,0

,,0

,,2 ,,0

,,2 ,,0

,-, ,-2 ,,2 ,,0

,-, ,-2

,,2 ,,0 ,-, ,-2

/2 ,**3

+322 -

* **-/

* +. -

,**0

,

,

+ 12 ,+.- , ** .,3,

-1* .

+.2* +322 //*

+3//

2. ,**0

,2, +313 .

+ ,

* 2- . 3*

* 1 , / ,**0

.

* . , 3 * 2 , , +31/ . ,,

+/ +** /

* +3 * -- * +, + *.

,, , +1

,,0 ,,2 ,-2 ,-.- ,

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Page 8: Na-Cl ˘ˇˆ˙˝˛˚˜ ! #$ Raj-hss.org/journal/back_number/vol58_pdf/vol58no4_241_255.pdfˇˆ ˙ ˝˛˚˙˜ !"#$%&’()*+,-./0 12,3 4567 ˇˆ 8 39:; 12 ˇˆ  ?@*+ABC!D

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Table Concentrations of Ra and U isotopes in Na-Cl type saline waters

248

activity ratio activity ratioGeology

n.d.

n.d.

n.d.

n.d. n.d.

n.d.

n.d.

n.d. n.d.

Sea water

Ra Ra Ra/ Ra U U U/ UNo. *

(mBq/kg) (mBq/kg) (mBq/kg) (mBq/kg)

Na-Cl type saline water

a * * Tertiary

b

a Tertiary

b

n.d.

Tertiary

Tertiary

Tertiary

Granite

Tertiary

Tertiary

n.d. Tertiary

Tertiary

Tertiary

Tertiary

Tertiary

Tertiary

a Granite

b

*

* : Error shows standard deviation from counting statistics.

* : “n.d.” denotes “not detected”. Detection limit is three times of blank level (see text)

* : The data sets of Ra and U isotopes in sea water were referred from Inoue ( ) and Ku

( ), respectively.

* : The geology was referred from stratigraphic column of each spring.

Ra Ra

U . mBq kg Fig. U

Cl U

No.

Fig. U U

UO

UO

U UO

et al. et al.

,

,,0 ,,2 ,,2 ,,0 ,-2 ,-. ,-. ,-2.

+ ,

-

+

,

-

.

,,2 ,,0

,-2 ,-2

,-2

,,

,

,

-/, +, +,1+ +-3 *4*.1 *4**1

-03 +* +,33 +-3 *4*+/ *4**.

,+0 0 0/. 1* *4*.+ *4**0

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

+412 *4,* ,4** *4.2 *4*+. *4**- *4*,. *4**.

/,4/ +42 ./4* .42

/40, *42* ,-4/ ,43 *4*+/ *4**- *4*-, *4**.

040. *403 24.2 +40, *4*,- *4**/

.*4+ +4+ .243 ,43 *4*+1 *4**-

0343 +40 +*+ 0 *4*,, *4**- *4*/* *4**.

+*4* +4. +/4+ ,4. *4+/0 *4*+, *4,.2 *4*+0

0,41 ,4/ 034- .43 *4*+3 *4**- *4*,/ *4**.

+*43 +4* +340 ,4, *4*,1 *4**. *4*/- *4**/

+30 / 30+ /+ *4*/1 *4**/ *4*3+ *4**1

-341 +42 -04- -4, *4*-, *4**. *4*00 *4**/

,*2, .* .+0. ,+0 *4*3- *4*+* *4,,* *4*+1

,,4+ +4/ .040 -41 *4*0- *4**0 *4,*- *4*++

34,1 *431 ,241 ,41

,.4. +40 -+40 -4, +4/+ *4*0 .4,3 *4+1

.4,, *4/, -4/* *42. ,4*. *4+* ,4., *4++

--1 +. 032 .1 *4+0+ *4*+, +4*1 *4*/

+03 0 -3, ,. *4*-- *4**. *4*/0 *4**/

+14, +4, .04- -40 *4++2 *4*+* *4.0. *4*,.

+31 1 .,1 ,0 *4*,1 *4**. *4*-. *4**.

,+.- .* .,3, +1. *4*+1 *4**- *4*,/ *4**-

+3+0 ,+ -32/ +00 *4*.3 *4*+0 *4*00 *4**1

+4*/ ,4/- *4-2 14+. .*41 ,4/

+ -40+ *4.+

+ -4/, *4-3

, -4*, *4-.

, ,432 *4-. ,4/+ *412

- +4+- *4-* +403 *4/*

. *420 *4+*

/ .4+2 *413 ,4+1 *4/3

0 +4,2 *4,2

1 +4,, *4*2

2 +4./ *4*3 ,4,2 *4.+

3 +4/, *4-, +4/3 *4+0

+* +4++ *4*3 +4-, *4,3

++ +42* *4,0 +430 *4-+

+, .43* *4,3 +4/3 *4+3

+- *43+ *4*3 ,4*. *4-+

+. ,4** *4++ ,4-2 *4-,

+/ ,4++ *4,, -4,* *4-0

+0 -4*3 *4.-

+1 +4,3 *4+0 ,42. *4+1

+2 *42- *4,, +4+3 *4*2

+3 ,4*1 *4+0 0400 *4/3

,* ,4-+ *4+0 +402 *4,0

,+ ,403 *4,2 -43- *4-3

,, ,4+1 *4+/ +4,2 *4,-

,- ,4** *4*3 +4/, *4-/

,- ,4*2 *4*3 +4-1 *4.1

*4,+ ,432 +4+. *4*-

+

,**1

+311

, *. /

+2

/

s

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Page 9: Na-Cl ˘ˇˆ˙˝˛˚˜ ! #$ Raj-hss.org/journal/back_number/vol58_pdf/vol58no4_241_255.pdfˇˆ ˙ ˝˛˚˙˜ !"#$%&’()*+,-./0 12,3 4567 ˇˆ 8 39:; 12 ˇˆ  ?@*+ABC!D

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Fig. Distributions of (a) Ra contents and (b) Ra/ Ra activity ratios for Na-Cl type saline waters ob-

tained from coastal area in Ishikawa Prefecture, Japan. Gray shaded area ( ) in Fig. (a) shows the

concentration higher than mBq/kg in Ra. Gray solid area ( ) in Fig. (b) represents the range

of Th/ U activity ratio of common rock (granite, basalt) in Japan reported by Miyake ( ).

Fig. The relationship between U concentration and Cl.

et al.

249

Na-Cl Ra

U U . .

U

Kigoshi, ; Yamamoto et al.,

,,0 ,,2 ,,0

,,0

,-, ,-2

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..

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in Pore Waters from Leg , Japan Sea, Proc. ODP, Scientific Results, / , Pt. ,

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Ra Ra Ra . mBq kg

. . Ra

Ra Ra Th U

U Ra TDS

Ra

Th Th Ra

Ra

Pu

Ra

No.

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Granitic and Basaltic Rocks in Japan. Proc. nd. Inter. Symp. Natural Radiat. Environ.,

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:

.

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.

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