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<br />III. FACILITIES AND EQUIPMENT <br /> <br /> <br />i ";~~;i:~ :: <br /> <br /> <br /> <br />. -. ..or: . ." <br /> <br /> <br />';y~::\.J' <br /> <br />Figure 12.-Sno-Cat Climbing Emerald Mountain Road. <br /> <br />truck and aircraft is based on the work of Mr. <br />J ames Fuquay and his associates at the Hanford <br />AEC establishment. The detector itself consists of <br />an isokinetic inlet tube, an ultra-violet irradiating <br />lamp, a light maze and photomultiplier detector <br />tube. Air is sucked through the detector by a vac- <br />uum pump-a motor driven unit in the truck, a <br />Venturi in the aircraft-and any zinc sulphide par- <br />ticles present are activated by the energy from the <br />ultra-violet source. The light maze allows the <br />particles to come through, but traps energy from <br />the irradiating source. The phosphorescing ZnS <br />particles sweep past the photomultiplier tube face, <br />producing a signal, and then exit into the slip- <br />stream. Detector heads are mounted on top of the <br />truck, and in the nose of the aircraft-a redundant <br />installation was used in the aircraft for reliability. <br />A control console contains the vacuum pump-for <br />the ground unit-UV lamp ballast, high voltage <br />supply for the photomultiplier tube, the gain con- <br />trol, and single channel strip recorder that displays <br /> <br />13 <br /> <br /> <br />, <br />'. <br />" '. <br />'./ <br />, , . <br />, ". <br />. f. <br />I 'J <br /> <br />~;~. ". <br />.'; ...... <br />f1:;""1.'~''''' <br />,;' ~,;""'"JI. <br />\ ) <br />\ -.; . - . ~ <br />:'4A"'='~ <br />~ . ;,to <br />-, J ...= ..,.." <br />. " ... <br />r . 1" <br />, <br /> <br />II <br /> <br /> <br />Figure 13.-Emerald Mountain Diffusion and Artificial Nuclei <br />Generator Test Station. <br /> <br />the PM (photomultiplier) tube output voltage. <br />Our units have a dynamic range of more than 1,000 <br />and have been calibrated quantitatively by taking <br />simultaneous chart records and millipore filter sam- <br />ples. Figure 17 is a data sample from the airborne <br />detector equipment. <br />From an engineering standpoint, the real-time <br />sampler has the important advantage of obtaining <br />instantaneous semi-quantitative measurements. It is <br />nearly as difficult to get accurate quantitative results <br />with this equipment as with the conventional <br />sampling techniques-Millipore filters or Rotorods <br />-because of the lack of a really good standard <br />against which to check instrument calibration. We <br />used a radio-actively-activated phosphor for a one <br />point calibration check on ground-based units, but <br />this is hardly adequate if stable quantitative results <br />are the goal. The important point is that, for our <br />operations, it would have been physically impossible <br />to obtain the plume dimensions that we wanted, in <br />the terrain over which we operate, and at a reason- <br />