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<br />• Sorter <br /> <br />One Radiometric Sorter consisting of a mechanical self-supporting structure <br />for the support of the sorter components. The sorter is equipped wi~~;h three <br />channels capable of discriminating between ore and non-uranium bearing waste <br />rock. <br />Ore from the vibratory feeders is conveyed through the sorter on a nominally <br />36 inch wide nylon woven belting with polyurethane covers top and boi:tom and <br />travelling at about 200 feet per minute. <br />The return portion of this belt is equipped with belt cleaning facilities <br />supplied by Ore Sorters Ltd. and is connected to a water line. <br />The washings from the belt are discharged below the sorter into a washings <br />conduit. (See Figure 3.1-1) <br />The conveyor belt is driven by a 3 h.p. 440 volt, 3 phase motor through a <br />suitable gear reduction mechanism. <br />Each channel of the sorter is equipped with three blast valves for the <br />deflection of selected ore-bearing rocks. <br />B. Electronic Equipment <br />• Gamma Ray Detector <br />Each channel is equipped with a one per channel, 2 inch diameter by 1 inch <br />thick Nal(TI) crystal, optically coupled to a photomultiplier tube of a type <br />similar to the "Integral Line" type 'S' supplied by the Harshaw Chemical <br />Company. The scintillation detectors are housed in a removable drawer within <br />the main lower lead container of the sorter. <br />The pre-amplifier, amplifier and gamma energy discriminator for each ~~hannel <br />necessary for acquiring gamma ray counts are also part of the gamma r,3y detector <br />system. <br />Video Detector <br />A Reticon Line Scanner and means of illumination (lamps with intensity of <br />15,000 lumens) necessary for generating gating signals and effective ~^ock <br />areas are an integral part of the sorting circuit. <br />Logic <br />One logic unit per channel is part of the system and functions to correct the <br />gamma count appropriate to a rock for the geometry of the rock, and t~~ deter- <br />mine whether or not the normalized count exceeds a pre-set "cut-off" level. <br />(0.015 U30g) <br />• In the event that a rock exceeds the cut-off level, the logic unit directs <br />the opening of the air blast valves to deflect such a rock away from :hose <br />ore particles whose corrected gamma count does not exceed the cut-off level. <br />1-4 <br />