LOENCO inc. - Analytical Chemistry (ACS Publications)


LOENCO inc. - Analytical Chemistry (ACS Publications)pubs.acs.org/doi/abs/10.1021/ac60208a733LOENCO inc. Anal. Chem. , 1...

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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-