ACKNOWLEDGMENTS Fhe author wishes to acknowledge the assjagtance of Dr. R.L. Mather and Dr. C.S. Cook whose suggestiong and critical re- wiew of the report were greatly appreciated, The assistance of Dr. D.L. Love and Mr. J, L. Mackin of Analytical and Standards Branch of Chemjca} Technology Division in preparing the calibrated standards is gratefully acknowledged. The excellent liaison both in regard tq samples and informatior€ between Radiological Capabilities Branch ef Ghemical Technolog: Piyisign and this Section was provided hy Mr, W. Williamson, J: The Gaussian curve generator was constructed by Mr. P.S. Applebaum. Members of the Electronics Section were cooperative at all times.

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