SCINTILLATORS-Big or small, we make them all Valves Part of a 26" χ 26" NE 102 Well-type plastic scintillator NE 102 Plastic Scintillator is avail able in any size or shape. Slab units for accelerator and cosmic ray studies. Thin sheets for beta particle counting, phosphor well counters. Continuous capillary flow counters for alcoholic solutions. NE 421 Slow Neutron Detectors of dispersed Lithium Fluoride with 96% enriched Li6. L i q u i d S c i n t i l l a t o r s , including NE 213 and N E 220 for internal count ing, especially of aqueous samples of tritium. N E 219 for filter paper count ing. NE 160 High Temperature Plastic Phosphor for measurement at tem peratures over 100° C. High Flash Point Scintil lators for safe, economical, giant liquid scintilla tor installations. NUCLEONIC INSTRUMENTS Pulse Shape Discriminating detec tion head units and related electronics. Gamma rejection ratio of 500:1. Higher detection efficiencies than ZnS detectors for fast neutrons in the presence of gamma rays. Universal Radiation Monitor. A scintillation detector, transistorized, 2 ' /2 lbs in weight, versatile, suitable for Industrial Health Physics, or Civil Defense applications. Radioisotope Analyzer. Designed to enable the user to quickly check the identity of a radioisotope and also to measure its activity. Used with those isotopes which emit gamma rays. "Tinytector." Pocket edition dose meter covering dose range 0.5 to 200 R/hr. , giving instantaneous readings of the radiation intensity. Dimensions: 45 /8" χ 25/s" χ 1s//'· Low price unit ideal for Civil Defense use and for civilian fall-out shelters. Other ranges available. 5 0 A l/EC CHEM SHOW REPORT Materials of construction is the word in valves. S tandard lines have been expanded in size to accommodate in creased need for th roughput . But the most noticeable trend is the wide variety of materials used. Corrosion resistant plastics, nongalling metal- to-mctal surfaces, plastics-metal com binations are in the forefront. Mod ifications to basic combinations or replacement of plastics by another member of the same family of plas tics makes the possible combinations almost unending and so the vises. Coupled with the materials picture are long service, low maintenance, and smoother performance in the face of higher temperatures, greater pressure, and more corrosive and abrasive materials handled. Elastomer pinch valves are still coming along. RKL Controls is working on a new one—a process valve which is fully supported and offers prepinched design for longer (Continued on page 53 A) Farris Engineering Co. announces an automatic /lex valve for abrasive and corro sive service. Valve provides full capacity and unobstructed flow. Closes bubble- tight on even small solids and will not freeze in outdoor service. Xonplugging valve is available in pure gum rubber, Buna S, Buna N, Xeoprene, Butyl, and combinations of each. Sizes. 7 to 12 inches. Temperatures to 1000° F. are not too hot for Hills-McCanna's new ball valve models. ^McCannaseal^ valves use Graphitar seats to boost temperature limits for nonoxidizing liquids or gases from previous maximum of 600° F. (attained with reinforced Teflon). For oxidizing reagents the upper limit is 700° F. Allowable pressure, at high temperatures depends on valve body materials 316 Stainless is suitable for pressures to 355p.s.i.g. at 1000-degree temperatures. Successful use of non- resilient high-temperature seals stems from new design —a spring forces the ball down into a wedge-seat arrangement to give leaktight closure. Valves come with screwed or socket weld end connections in 1- through 3-inch sizes; flanged ends, 7 inch through 8 inches. Take your choice of either manual or pneumatic operation. Circle No. 17 on Readers' Service Card NUCLEAR ENTERPRISES LTD. OMJ J lerry Mt. WINNIPEG 21 CANADA Associate Co.: Nuclear Entarprins (G. It.) I.I.I. Surhthlll. Edinburgh 11. Scotland Circle No. 27 on Readers' Service Card