ns»etintineatlrtineReie an n we Sm AeAa a Aa A ce Therefore, it was possible to plot the incident light, or ganna radiation, as @ function of the dynode voltage. All electronics were mounted inside a light-aluminum housing for protection from weather, thermal influences, end small blast pressures. The output was recorded on a bristol recording millivoltueter, which rucorded paca rates from 0.2 r/hr to iu! r/rr for 4 pariod from] minute to 2% Tours. For field installations, the instrumentation systems described in Sections 2.1.1 and 2.1.2 were inounted inside standard 55-gallon stuel druzs imbedded in concrete. Figure 2.1 i3 a block diagram of the detector systams. 2.1.3Special Detector System. A special detector system wes de~ signed and constructed todetermine the effects of high-garma rates and DETECTOR HEAD CRYSTAL TIMING SIGNALS : — Lae GROUND LEVEL . CONTROL UNIT FLIGHT PIPE —wa POWER UNIT RECORDER PHCTOBULTIS FLIER imape 2,1 Block dingvren of a typle#l detuetor cysten. Tha dotacting dlenant 49 oither a stiltens or an entbrac cna crystal “ipectirg on whettor it da part of a lowe or a hignsstasitivity cystan. cumulative exposures on the crystel datucting e@lecent. Two Ilsy-sonsitivity detector Inads were enployed: one dm normal usece cad the eccond covered with a Selinch*thick layer of lead shot to aticnuste the game rodistion reaching the crystal by a factor of atcut 160, Tha “norsal™ head detected is SECRET con tee ere eee eee