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After the diffusion periods, each cylindrical bentonite sample was cut with a knife into about 1-mm-thick slices. Each slice was immediately weighed in order to calculate distance from the surface of bentonite specimen and was analyzed for radioactivity with a Geiger Mu ller (GM) counter (Aloka). Because the half-life of 75Se is short (119.8 days), the concentration profiles were determined by correcting for radioactive decay.

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