Condomines M, Rihs S, Lloret E, Seidel J L
Géosciences Montpellier, Université Montpellier 2 et CNRS, place Eugène Bataillon, 34095 Montpellier cedex 05, France.
Appl Radiat Isot. 2010 Feb;68(2):384-91. doi: 10.1016/j.apradiso.2009.10.056. Epub 2009 Nov 10.
Our method for the simultaneous determination of the four natural Ra isotopes ((226)Ra, (228)Ra, (224)Ra and (223)Ra) in thermal waters involves a separation of Ra on a selective filter (3M EMPORE Radium Rad disk), and a single counting using a broad-energy HPGe detector (BE Ge manufactured by CANBERRA). The calculation of (223)Ra and (228)Ra activities requires interference and cascade summing corrections. The (226)Ra activities in CO(2)-rich thermal waters of the Lodève Basin (South of France) range from 530 to 2240mBq/l. The low ((228)Ra/(226)Ra) activity ratios (0.19-0.29) suggest that Ra is mostly derived from the aquifer carbonates. The short-lived (224)Ra and (223)Ra are probably added to the water through recoil or desorption processes from Th-enriched coatings on the fracture walls.
我们用于同时测定温泉水中四种天然镭同位素（(226)Ra、(228)Ra、(224)Ra和(223)Ra）的方法包括在选择性滤器（3M EMPORE镭盘）上分离镭，并使用宽能高纯锗探测器（由堪培拉公司制造的BE Ge）进行单次计数。(223)Ra和(228)Ra活度的计算需要进行干扰和级联求和校正。法国南部洛代夫盆地富含二氧化碳的温泉水中(226)Ra活度范围为530至2240mBq/l。低的((228)Ra/(226)Ra)活度比（0.19 - 0.29）表明镭主要源自含水层碳酸盐。短寿命的(224)Ra和(223)Ra可能是通过裂缝壁上富含钍的涂层的反冲或解吸过程添加到水中的。
