05-17-化学-齋藤先生.indd

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1 No pp Estimation of Growth Rate of Hokutolite from Tamagawa HotSpring Takashi SAITO Received September 30, 2004 Concentrations of radium isotopes and the progenies 226 Ra, Ra and Thin three hokutolite samples and the hot spring water from Tamagawa hotspring were measured. These isotopes were analyzed by a welltype HPGe ray spectrometer for the 351, 609, 911 and 583 kev rays from 214 Pb, 214 Bi, Ac and 208 Tl, respectively, each being in radioactive equilibrium with precursors. The 226 Ra concentrations are in the range of 5085 Bq/g, being higher in the lower layer. The Ra concentrations are in the range of Bq/g, being higher in the upper layer. The activity ratios of Ra/ 226 Ra provided the estimation of the growth rate of hokutolite ( mm/y). These estimated growth rate 2- were correlated with SO 4 concentration in Tamagawa hotspring water. Estimated Ra/ 226 Ra activity ratios in Tamagawa hotspring water from hokutolite surface activity were concordant with those of the hotspring water. Keywords: Hokutolite, Tamagawa hotspring, radium, activity ratios of Ra/ 226 Ra, growth rate of hokutolite, ray spectrometry 1 BaPbSO Ra : 5.75y 226 Ra: 1600y Ra/ 226 Ra 2, Plates 13 Hokutokite A : mm Hokutolite B : Hokutolite A 0.5mm Hokutolite C : 1960 : Department of Chemistry, College of Humanities and Sciences, Nihon University: Sakurajosui Setagayaku, Tokyo, Japan 203 1

2 齊 藤 敬 行った しかし 226 Ra の 186 kev のガンマ線の分岐比は 3.5 と小さく エネルギーもガンマ線としては低いた め 他の核種によるガンマ線のコンプトンバックグラウ ンドに隠れてしまう可能性がある また Ra, Th も 同様にガンマ線のエネルギーと分岐比が小さいため ガ ンマ線スペクトロメトリーによる定量は難しい そこ で それぞれの核種と永続平衡に達しており ガンマ線 のエネルギーと分岐比が大きい核種の放射能から濃度を 求めた 226 Ra は 214 Pb 351 kev と 214 Bi 609 kev Ra は Ac 911 kev Th は 208 Tl 583 kev のガンマ線を それぞれ測定した Plate 1: Hokutolite A 3 1 玉川温泉産北投石 Hokutolite A, B は彫刻刀で mm の厚さに薄く 削り出し Hokutolite A は 6 層と 8 層に Hokutokite B は 5 層に分け取った Hokutolite C は北投石の生成した 表層のみを削り出した それぞれの試料は 約 0.1 g を 精秤した後 ポリプロピレン製の測定容器に封入し EURYSIS 社ウェル型ガンマ線スペクトロメータで目的 核種のガンマ線を測定した 3 2 玉川温泉温泉水 温泉水中のラジウムの濃度は SAITO ら 8 の陽イオン 交換樹脂を用いた連続バッチ法を参考に測定を行った ある一定量の試料水中のラジウムの量を C0 とし, 1 回 Plate 2: Hokutolite B 目の捕集操作と 2 回目の捕集操作により回収されたラジ ウムの量をそれぞれ C1, C2 回収率をαとしたとき 以 下の式が成り立つ C1 C0 α C2 C0 C1 α α 1 C2 /C1 C0 C1 /α C1 / 1 C2 /C1 これより C1, C2 のラジウムの量から初めの試料水中 のラジウムの量 C0 が算出され 使用した試料水の量か ら試料水中のラジウムの濃度が求められる 温泉水試料 10L に対し 陽イオン交換樹脂 DOWEX 50W X mesh を 35g 加え 15 分攪拌 10 分静置 Plate 3: Hokutolite C (Recently fomed hokutolite) し樹脂を取り出した 残った溶液に再び陽イオン交換樹 脂を同量加え同様の操作を行い 樹脂を取り出した 玉川温泉温泉水 つの樹脂はそれぞれ風乾させた後 ブリキ製の測定容器 温泉水試料は 玉川温泉ホテルにて販売している温泉 に密封し 226 Ra の娘核種が放射平衡に達するまで 30 日 水 源泉より約 400m 下流地点 を 2003 年 6 月から 2004 以上静置したのちガンマ線スペクトロメータで目的核種 年 5 月まで 1 ヶ月ごとに購入したものを用いた のガンマ線を測定し C1 と C2 を求めた 3 実験操作 4 結果と考察 北投石と温泉水の中の 226 Ra, Raおよび Th 半減期 : y は ガンマ線スペクトロメトリーにより定量を 北投石中のラジウム濃度と同位体比 Hokutolite A と Hokutolite B の 226 Ra と Ra の濃度と

3 Fig.1 Hokutolite A, B Fig.1 Hokutolite A, B Figure1 Ra 226 Ra 1.5 mm Ra Ra SAITO 2 MOMOSHIMA Ra 7 Ra/ 226 Ra Ra Th 226 Ra Th/ 226 Ra Fig.2 Figure Ra/ 226 Ra Th/ 226 Ra Ra/ 226 Ra Ra Th Ra Th Th A Th { Ra / Th Ra } A Ra Ra / Th Ra 1.50 A Th, A Ra Th, Ra Th Ra 1.50 Fig. Th/ Ra Ra Th 4 2 Fig. Hokutolite A 1.5mm YOSIIKE 9 2 SO BaSO 4 SO 4 Ra/ 226 Ra SO 4 9 Fig.3 Figure 3 Ra/ Ra SO Fig.1 Concentration of Ra and 226 Ra of the two hokutolite A and B along the depth from the surface. : Hokutolite A ( 226 Ra); : Hokutolite A ( Ra); : Hokutolite B ( 226 Ra); : Hokutolite B ( Ra) Fig.2 Activity ratios of Ra / 226 Ra and Th / 226 Ra of the two hokutolite A and B along the depth from the surface. : Hokutolite A ( Ra / 226 Ra); : Hokutolite A ( Th / 226 Ra); : Hokutolite B ( Ra / 226 Ra); : Hokutolite B ( Th / 226 Ra) 205 3

4 Fig.3 Activity ratios of Ra/ 226 Ra of the two hokutolite A and B along the depth from the surface and concentration of SO 4 2- in Tamagawa hot-spring water from : Hokutolite A ; : Hokutolite B; : SO Hokutolite A 1973 Hokutolite B Ra/ 226 Ra Table 1 Table mm/y mm/y 2, 5, 6 SO SO SO 4 BaSO Hokutolite A, B Hokutolite C Ra/ 226 Ra Table Table 3 22 SAITO 8 Ra/ 226 Ra Fig. 4 Figure 4 SAITO pH m

5 Fig.4 Concentration of radium and the progenies, and activity ratios of Ra/ 226 Ra in Tamagawa hot-spring water. : 226 Ra; : Ra; : Th; dashed line: Ra/ 226 Ra 9000 L/min N. SAITO, Y. SASAKI and H. SASAKI, In Geochemistry of the Tamagawa Hot Springs. Tokyo, pp T. OKUBO and M. SAKANOUE, Geochem. J., 9 (4), (1975). 4N. MOMOSHIMA, J. NITA, Y. MAEDA, S. SUGIHARA, I. SHINNO, N. MATSUOKA and C. W. HUANG, J. Environ. Radioactivity, 37 (1), 8599 (1997). 5B. TAKANO, B. K. WATANUKI, Geochem. J., 6 (1), 1 9 (1972). 6N. SASAKI and K. WATANUKI, Mineralogical J., 11 (6), (1983). 751 (4), (2002). 8T. SAITO, T. OHTA and J. SATO, J. Balneol. Soc. Jpn, 52(1), 111 (2002). 9Y. YOSIIKE, Geochem. J., 37 (6), (2003). 10K.WATANUKI, Proc. SITH2003, pp (2003)

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