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ANALYTICAL CHEMISTRY
their great penetration through matter and (2) their biological effects. The handbook summarizes currently available methods for determining energy absorption in matter as a result of its interaction with neutrons. Since neutrons are almost invariably accompanied by gamma radiation, mixtures of gamma radiation and neutrons are included. Such a measurement endeavor is referred to as mixed radiation dosimetry, although the term "absorbed dose" is reserved to refer to only one of the quantities of interest, namely the specific absorbed energy in specified medium (e.g., ergs per gram of water). Only the physical aspects of the interaction of radiation with matter are discussed. Methods for the measurement of energy absorption in matter include calorimetry, Bragg-Gray cavity ionization chambers and counters, photographic emulsions, liquid chemical systems, dosimetry through neutron spectrum measurements, and special counting methods. Included also are tables comparing specific devices for various kinds of measurements. Tables and graphs of first collision dose for photons and neutrons are given.
Research Highlights of the National Bureau of Standards, Annual Report 1960. NBS Misc. Pub. 287, 1S9 pages. 65 cents.
"Research Highlights" presents in compact, digest form an illustrated account of National Bureau of Standards research and measurement activities in fiscal year 1960. Approximately 225 programs in 18 different fields of research and development are described. Noteworthy accomplishments reported include determination of an improved value for the faraday, determination of a new value of the atomic weight of silver, placing in operation of improved atomic frequency standards, properties of electromagnetic radiation, and of particles and their interactions, and length of the international standard meter bar. Additional features of "Research Highlights" include a complete list of NBS publications and patents for fiscal 1960; a description of the calibration, testing, and standard sample services to science, industry, and government : a resume of the NBS cooperative research programs with industry and of its cooperation with Federal, State, and local governments, professional societies and standardizing bodies, and many international groups to solve problems relating to measurement standards and techniques.
