Image:Godiva II critical assembly.png

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Description

Godiva II critical assembly mounted on stand.

Description of the Field Geometry and the Godiva II Critical Assembly

The Godiva critical assembly is located in a building called a Kiva.[1] The Kiva is located on a canyon floor (Fig. 1)[2] and is 1/4 mile from the control room. Measurements were made along the road leading from the Kiva to the control room. The active material in the Godiva II assembly is made up of a bare mass of approximately 60 kg of enriched U235. The critical mass is a right circular cylinder 7 inches in diameter with a hemispherical dome, mounted on a triangular stand (Fig. 2).[3] The critical mass is surrounded by a wire screen cage 9 inches in diameter. The horizontal midplane of the critical mass is approximately 78-1/2 inches from the Kiva floor.[4] The electronic control circuitry occupies a position on the stand. There are numerous mechanisms and interlocks which provide a maximum degree of safety. No shielding is around the assembly itself, but the concrete Kiva (20-inch walls, 8-inch ceiling), the block house (Fig. 1), and the canyon walls create conditions that complicate "free air" measurements.[5]

Notes

  1. ↑ Kiva, the Indian name for a ceremonial house, is used for the building which houses the critical assemblies.
  2. ↑ Fig. 1 is Image:Godiva II location.png
  3. ↑ Fig. 2 is Image:Godiva II critical assembly.png
  4. ↑ The specific height above the floor is dependent upon whether the assembly mount is placed on casters.
  5. ↑ Engelke

References
Source

from http://www.fas.org/sgp/othergov/doe/lanl/lib-www/la-pubs/00316018.pdf
Date

May 1961
Author

Morris J. Engelke; Edwin A. Bemis, Jr.; J. A. Sayeg
Permission
(Reusing this image)
Public domain This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made during the course of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag.
Specifically, this image comes from Los Alamos National Laboratory. LANL requires the following text be used when crediting images to it[1]:

Unless otherwise indicated, this information has been authored by an employee or employees of the University of California, operator of the Los Alamos National Laboratory under Contract No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. Government has rights to use, reproduce, and distribute this information. The public may copy and use this information without charge, provided that this Notice and any statement of authorship are reproduced on all copies. Neither the Government nor the University makes any warranty, express or implied, or assumes any liability or responsibility for the use of this information.


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