Abstract
We report a new method for the measurement of 24Ra ( T 1 2 = 3.6 days ) in natural waters. 224Ra preconcentrated from water samples by adsorption onto manganese-dioxide-impregnated acrylic fiber (Mn-fiber). The amount of 224Ra adsorbed on the fiber is determined by stripping its daughter, 220Rn, directly from the fiber bundle by circulating a stream of air through it and measuring the 220Rn activity concurrently. This method is simple, fast, sensitive, accurate and inexpensive. The counting system is portable, and is easily adapted for shipboard use in oceanographic investigations. The same equipment may also be used for measuring 228Th ( T 1 2 = 1.9 years ) and 226Ra ( T 1 2 = 1600 years ). 224Ra activities in water samples collected from continental shelf and estuarine waters of the eastern U.S. coast are presented.
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