: 2.3.2 Altitude Absorption. The automatic gamma monitors, HASL TN-4-C, were mounted on the YAG-S9 and YAG-40, Each instrument was mounted at the end of a boom that was also used to suspend the depth probe of Project 2.62. The boom extended 35 feet from the side of the ship and was set al an approximate mean height of 35 feet above the sea. An Esterline-Angus wo ewe oe ee ae F, strip~chart recorder was installed in the shielded control room on the ship, to continuously record the gamma dose rate, The installation of the monitors and recorders was accomplished ’ by Project 2.10. Scintameter survey meters, HASL TH-3-B and TH-7-A, were used for helicopter operations. Gamma dose rate was measured at various altitudes over contaminated water and land surfaces. _ + ‘ COPILOT rz e va PuoT 4 ‘ wo RADAR OPERATOR —— r—O Radiation su y rf URVEY ——— OPrnaton = | i Loe DETECTOR CONTROL ASSY. Rl “~~ TELEMETER ASSY. navigator —— ——C cy Lom POWER SUPPLY ( LOWER DECK) > T 4 4 P CeresToR . 3 -—— TELEMETER RADIO TRANSMITTER STEPS CAME aSsemBiY—“] ~N p—— CAMERA MATCH ~ ° RADLATION DETECTOR . 4 a rt -_,,. | ween cen ng: No me bee mee wot | AIRCRAFT RADKO ALTIMETER Figure 2.3 Radiation-survey-equipment mounting locations in P2V-5 aircraft. A gamma spectrometer, HASL TM-10-A, which consists of a scintillation bead, pulseheight analyzer, and a recorder, was loaded into the same helicopter. The 28-volt power in the belicopter was converted to 115 volts, 60 cps, by a separate inverter to supply the spectrometer. _ The count rate at various energy levels was observed on a meter as the base line automatically swept through an energy scan from 50 kev to 3 Mev. The survey aircraft had the same instrumentation as described in the previous section, plus a scintameter survey meter, TH-3-B. 2.4 REQUIRED DATA ‘| “The project operations were directed mainly toward| obtaining isodose Plots of the gamma . . - O *