4 eR| ray ays ae iy CHAPTER I OBJECTIVE The objective of beta-densitometer instrumentation at Ivy Mike shot was, primarily, to measure material density near the ground surface as a function of time and, secondarily, to test the latest modifications to previous densitometer models. * sya et r4 é FORMERLY R=STRICTED DATA WANES AS RESTRICTED 02 TA IN FOREIGN DISBERINATION EAs PPT Mae SELTION 1448, ATOMIC ENERGY ACT, 2954 & ib ai RES 7 DATA (ERY — security INFORMATION — oF wtam AL wee coed

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