May 1960: 21 | OO P/ Under the 443s Hotel section, it is repo rted that the D&Ar plan hes peen reviewed by ARPA who has had a favorabl e Yeaction but further requested an interium detection system that could operate in 18 months rather than 4 years. “A proposal for such an interiun cetectio n system is bein; prepared at LASL. is based on the detection of the themoradiati on (x-rays) by a gto detectors operatins in coincidence," Tb rent Nation ‘ More P-Division detector packeges and expericments have veen carried olort by an Atlas and a Zonopha rocket. My impression through the se Many«months since the last test series in looking at the discussions under the heading of "desiz n and development of nuclear systems » feneral weapons developnent,” is that the erers addressed or at least ronorted on are fairly routine extensions and refinements af technicues alresdy mown. May 1960: Gemma ne Under test plenning snd evaluation, the only two heading are: Alpha measurements ‘ang ana NTS. NTS. Under Under the ti first ivst it it is is noted noted that wt P/ Fe¥s#6 pe personel concerned with Alpha measurements visited LASL and the -enerel feetures of future measurements were discussed. 4 The vrincips! incipri Teatures Zeatures different dif x ; i the future Put % detectors detectors will from past systems are that in most will xe collimated ced, close together, i and relativel; 3 * close i > to the * COrt conn, tuses mre exec eeted ees Since 221 P hoto to be near each other, common timing of all date channels becones relatively easy. The aéventese to pe gained is more accurate dats. with Jess deperdence wi oseilloscove yeading errers.

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