HIGH VOLTAGE ENGINEERING CORPORATION

As part of a larger study of the degradation of polymers, cotton cellulose is being intentionally degraded with high voltage electrons. The initial results were reported earlier (1). Because of the implications of this study to the electron microscopy of beam sensitive materials, special attention is being given to relating these studies to electron microscopy.Generally, the microscopist's main, and perhaps only, information on specimen degradation is that provided by diminution of the electron diffraction pattern. It will be shown in this paper that even though specimen diffraction patterns are only slightly altered, the mechanical and chemical properties are vastly changed.To produce degraded fabrics having strength losses of 75% or more, cotton fabrics were exposed to radiation doses of 50 and 100 Mrad at 550 kV in an electron accelerator manufactured by High Voltage Engineering Corporation. Properties of such cotton fabrics before (i.e., control) and after exposure to 50 and 100 Mrad dosages are presented in Table I.

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HIGH VOLTAGE ENGINEERING CORPORATION

Analytical Chemistry ◽

10.1021/ac60171a755 ◽

1961 ◽

Vol 33 (3) ◽

pp. 66A-66A

Keyword(s):

High Voltage ◽

Engineering Corporation ◽

High Voltage Engineering

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RADIOCARBON IN MEXICO: FROM PROPORTIONAL COUNTERS TO AMS

Radiocarbon ◽

10.1017/rdc.2021.58 ◽

2021 ◽

pp. 1-7

Author(s):

Corina Solís ◽

Efraín Chávez ◽

Arcadio Huerta ◽

María Esther Ortiz ◽

Alberto Alcántara ◽

...

Keyword(s):

Mass Spectrometry ◽

Sample Preparation ◽

High Voltage ◽

Accelerator Mass Spectrometry ◽

Science And Technology ◽

National Council ◽

University Of Arizona ◽

Technological Developments ◽

High Voltage Engineering ◽

The University

ABSTRACT Augusto Moreno is credited with establishing the first radiocarbon (14C) laboratory in Mexico in the 1950s, however, 14C measurement with the accelerator mass spectrometry (AMS) technique was not achieved in our country until 2003. Douglas Donahue from the University of Arizona, a pioneer in using AMS for 14C dating, participated in that experiment; then, the idea of establishing a 14C AMS laboratory evolved into a feasible project. This was finally reached in 2013, thanks to the technological developments in AMS and sample preparation with automated equipment, and the backing and support of the National Autonomous University of Mexico and the National Council for Science and Technology. The Mexican AMS Laboratory, LEMA, with a compact 1 MV system from High Voltage Engineering Europa, and its sample preparation laboratories with IonPlus automated graphitization equipment, is now a reality.

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