Abstract
Plutonium-239 or americium-241 in ashed samples of bone, liver, spleen, feces and urine, dissolved in 0.1N HCl, was assayed by a liquid scintillation method, using Triton N-101-xylene-PPO. A commercially available liquid scintillation spectrometer was used, and essentially 100% counting efficiency was achieved. There was close agreement between analytical results obtained with this liquid scintillation method and with a previous one employing toluene-ethanol-PPO; also between results obtained with liquid scintillation spectrometry (LS) as compared to proportional counting (PC). LS is generally superior to PC because it is less laborious and time-consuming, yields closer replication of analytical values, and permits more analyses per experiment, since tissues low in activity can be counted individually, rather than pooled. The Triton N-101-xylene-PPO scintillation fluid has advantages over toluene-ethanol-PPO: It permits the use of larger volumes of aqueous samples, holds more insoluble matter in suspension (due to gelation), and, in most cases, allows vials to be stored indefinitely without apparent loss of activity. Simple instrumental methods of detecting and correcting occasional aberrant samples are described.
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