REPORT
A truly miniature Millivolt Recorder with big size performance Taylor's 720J Series Recorder requires only a 6" χ 6" panel cutout, but gives you all these features. • Continuously records one variable with either Millivolt or Thermocouple in puts. • Span and Zero continuously adjustable from front. Span: 5 to 50 mv. Zero: minus 50 to 0 to plus 50 mv. . Calibrated Accuracy: + 0 . 5 % . Sensitivity: ± 0 . 1 % • Input Impedance: 2 megohms at Bal ance. • Thermocouple Burnout Protection: Up scale or downscale drive.
• 4" Rectilinear Chart Record available with tear-off chart feature. Ideal for filing in record books. • Pen Actuation: Electronic Null-Balance Servo Motor. • Speed of Response: Less than one sec ond for full scale travel. • Retransmitting Slidewires: Up to two available; 270° output. • Alarms: Up to two, servo operated. • Standardization: Cascaded zener diodes. For full details see your Taylor Field En gineer or write for Bulletin 98434. Taylor Instrument Companies, Rochester, N e w York and Toronto, Ontario.
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A NEW FLEXIBLE LOW-COST MODEL 160 SERIES DUAL C O L U M N P R O G R A M M E D GAS
CHROMATOGRAPHS
A n e w c o n c e p t of high p e r f o r m a n c e a n d c o n v e n i e n c e in o p e r a t i o n — p l u s great flexibility — a w i d e selection of r i s e r a t e s a n d f a s t e r b l o w - d o w n — all at a n e w low cost — distinguish the n e w M o d e l 1 6 0 Series built around a n e w basic column oven design. A n entirely n e w a u t o m a t i c prepara t i o n g a s c h r o m a t o g r a p h is i n c l u d e d in t h e s e r i e s w h i c h h a s 3 d i s t i n c t models and 4 additional combina tions of optional equipment. T h e out standing features of each represent a valuable contribution to the art and science of gas chromatography. , 5 6 5 . 0 0 . T o properly appraise t h e application w r i t e for M o d e l 1 6 0 D a t a S h e e t .
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of this program and indicated future plans. "Since 1958 when NuclearChicago began distribution of ra dioactivity standards," he said, "the program has been constantly expanding." Some of the radioac tivity standards available from Nu clear-Chicago are C 14 , Cs 137 , Co60, Au 1 9 8 ,1 1 3 1 , Fe 59 , K42, and Sr80. The main methods of standardization are 4ir beta-gamma coincidence counting, 4ττ gamma ionization chamber measurement, 4ττ beta counting, or liquid scintillation counting. Aliquots of most of the standard solutions are sent to the NBS for measurement. Some of these standards are shipped on a twice-a-year basis; in 1964 some will go to six-a-year. Standards for liquid scintillation counting will be made available, also. A member of the audience asked about a reported discrepancy be tween a special Cs 137 burn-up standard from Nuclear-Chicago and a recent IAEA Cs 137 standard. This subject had been discussed at the NRC subcommittee meeting the previous day, and a partial explan ation had been found in the fact that the Nuclear-Chicago standard was calibrated in 0.663 m.e.v. gamma photons per milliliter while the IAEA standard was expressed in absolute disintegrations per mil liliter. Dr. Houtermans of the IAEA announced that IAEA would shortly distribute a series of Cs 137 solutions for comparison among a number of laboratories, and that the IAEA would correlate and report the re sults. The importance of accurate decay scheme information and the need for inclusion of these data on the standard certificate was again emphasized. In response to a ques tion from the moderator, Ε. Ε. Beauchamp of ORNL, who was in the audience, outlined briefly the present efforts by the American Standards Association (ASA) to ob tain a uniform certificate for isotope shipment. ASA Subcommittee N5.4, Radioisotope Use and Han dling, is working through the Inter national Standards Organization and is attempting to get a certificate approved which will list much of the same material that is proposed for the standard certificate. Beau-
