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This is the third edition of the Index of Crystallographic Supplies prepared on behalf of the International Union of Crystallography by its Commission on Crystallographic Apparatus. The first was compiled by Professor A. Guinier in 1956 and the second under the editorship of Dr. A. J. Rose in 1959. At that time, it was intended that publication of revised editions of the Index should be a continuing project of succeeding Commissions. However, with changing membership and other pressing activities, the preparation of the third edition has been dependent on the acquisition of a Commission member with appropriate experience and enthusiasm. The Commission is therefore fortunate that Professor R. Rudman, who has had considerable experience in the collation of information on crystallographic matters, has undertaken this task. He has been assisted by the advice of the members of the 1969-72 Commission, in particular that of a group which, during a meeting in Marseille, France, July 4-6, 1971 to discuss Commission affairs, went over the draft of the Index in close detail. These included S. C. Abrahams, U. W. Arndt and D. M. Kheiker. The information included in the Index was gathered from replies to a questionnaire which was sent to a wide range of manufacturers and suppliers throughout the world. It is not intended as complete and exhaustive but it should provide a convenient starting point for the location of the appropriate sources of equipment and materials of use to crystallographers.
Volume 20 of Reviews in Mineralogy attempted to: (1) provide examples illustrating the state-of-the-art in powder diffraction, with emphasis on applications to geological materials; (2) describe how to obtain high-quality powder diffraction data; and (3) show how to extract maximum information from available data. In particular, the nonambient experiments are examples of some of the new and exciting areas of study using powder diffraction, and the interested reader is directed to the rapidly growing number of published papers on these subjects. Powder diffraction has evolved to a point where considerable information can be obtained from ug-sized samples, where detection limits are in the hundreds of ppm range, and where useful data can be obtained in milliseconds to microseconds. We hope that the information in this volume will increase the reader's access to the considerable amount of information contained in typical diffraction data.
Developments in Economic Geology, 7: Nuclear Methods in Mineral Exploration and Production elaborates on the status of applicable nuclear techniques used in mineral exploration and production. The selection first offers information on radiometric methods and X-ray analysis in mineral exploration. Discussions focus on gamma-ray spectrometry, radon detection, autoradiography of uranium and thorium, X-ray diffraction, and application of X-ray analysis. The text then examines X-ray fluorescence geochemical analysis on the surface of Mars and radioactivation methods, as well as nuclear geochemical measurements of planetary surface; radioactivation methods for mineral exploration; and radioactivation sources. The publication takes a look at nuclear well logging for petroleum and the potential of plowshare for resource development. Topics include natural radiation, induced logs, description of potential applications related to energy resources, and obstacles to the development of a commercial plowshare program in the U.S. The selection is a dependable source of data for readers interested in the use of nuclear techniques in mineral production and exploration.