NOTESVol. 60 solute value of the standard is not known closer than * 10%. Therefore, the actinium fluoride neutron emission rate determined experimentally is probably no better than f 15 to 20%.However, since the neutron emission from the fluoride sample, and the theoretical growth curve agreed quite closely over the growth period, and since the theoretical and experimental maximum values are of the same order of .magnitude, one can conclude that the values that were used for computation are approximately correct, and the neutron yields obtained by extrapolation from data in reference six are not unreasonable. Thus, the use of neutron counting techniques for quantitative detection of trace quantities of fluorine in actinium appears feasible. There seems to be no serious objection to extending the technique to the detection of fluorine or other light elements, such as beryllium or boron, in any of the alpha-active heavy elements.We wish t o acknowledge the assistance of Mr.R. D. Joyner and Mr. S. R. Orr, who found time between their regular duties to prepare the actinium fluoride and to perform the calorimetric assay. We are also grateful tq Dr. H. W. Schamp for his assistance with the sealing problem.
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