Collection of Radium Isotopes in Natural Waters by Manganese-Impregnated Acrylic Fiber
نویسندگان
چکیده
An attempt was made to apply Mn-impregnated acrylic fiber to the collection of small amounts of Ra isotopes in natural waters. The Mn compound incorporated in this material was estimated to be KMn8O16•E H2O, which occurred naturally in Japan as cryptomelane. Collection by the Mn-impregnated acrylic fiber was effective in the pH region higher than 4 and the collecting efficiency was dependent on the temperature of water. Radium concentrations observed at the upper stream of Tamagawa River tended to increase after rainfalls. The observed rises in Ra concentrations suggested that the rainfalls forced the stored water in the subsurface layer of the ground to discharge into the river water system.
منابع مشابه
Measurement of 224Ra and 225Ra activities in natural waters using a radon-in-air monitor.
We report a simple new technique for measuring low-level radium isotopes (224Ra and 226Ra) in natural waters. The radium present in natural waters is first preconcentrated onto MnO2-coated acrylic fiber (Mn fiber) in a column mode. The radon produced from the adsorbed radium is then circulated through a closed air-loop connected to a commercial radon-in-air monitor. The monitor counts alpha dec...
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