Memorandum from Arthur Waltner to Clifford K. Beck

%MurNBpersonnel101751; ]> Memorandum from Arthur Waltner to Clifford K. Beck Machine readable transcription Waltner, Arthur Creation of machine-readable version: Russell S. Koonts Creation of digital images: Russell S. Koonts Conversion to TEI.2-conformant markup: Russell S. Koonts ca. 9 kilobytes NCSU Libraries Raleigh, NC Modern English, MurNBpersonnel101751

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URL: http://www.lib.ncsu.edu/archives/etext/engineering/reactor/murray/

23 October, 2000

Nuclear Reactor Digitization Project

Raymond L. Murray Reactor Project Notebook

Illustrations have been included from the print version. Scanned by Russell Koonts with Photoshop 5.0 software. Memorandum from Arthur Waltner to Clifford K. Beck Arthur Waltner

1 p. Manuscript copy consulted UA 105.16

Prepared for the North Carolina State University Science and Technology Electronic Text Center

The lineation of the manuscript has been maintained and all end-of-line hyphens have been preserved.

Keywords in the header are a local Science and Technology Electronic Text Center scheme to aid in establishing analytical groupings.

Library of Congress Subject Headings October 17, 1951 English LCSH manuscript 24-bit color: 400 dpi Memorandum from Arthur Waltner to Clifford K. Beck Typescript 1 p. October 17, 1951 MurNBpersonnel101751

October 17, 1951 TO: Clifford K. Beck FROM: Arthur Waltner CC: Reactor Committee SUBJECT: Personnel Monitoring REFERENCE: Conference, William Herman, Health Physics Division, BrookhavenNational Laboratory.

A. The routine personnel monitoring at BNL makes use of film badges and pocket chambers. The film recommended is Dupont 508 Adlux. This film pack has a range of 10 mr to 1000 r. Dupont 552 having a range of 50 mr to 40 r has been used in the past. Each of the film badges contains two photographic films, one being much more sensitive then the other.

The pocket chambers used include those manufactured by Victoreen, Keleket, and Cambridge. Most of the chambers are made by Victoreen.

Film badges containing Kodak NTA nuclear emulsion on an acetate base are used in neutron monitoring. Neutrons are detected by the proton recoil method. A weekly fast neutron tolerance dose results in eight proton recoils per twenty-four fields of view with a field diameter of 150 microns.

B. All photographic work is carried out in an air conditioned laboratory. It is recommended that this work be done in a cold region away from the reactor and hot laboratories.

C. Weston densitometers with a modified expanded low scale are used in reading film badges. One Photovolt densitometer is also used. It is a more versatile although a more expensive instrument.

D. It is recommended that the dessicant be removed from the caps of the Victoreen pocket chambers and the uncapped chambers be stored in a drying cabinet. Such a cabinet can be built by adding five incandescent lamps to each shelf of a standard metal storage cabinet. Fifteen watt lamps are burned continuously resulting in a temperature of approximately 90°F.

L. Faulty pocket chambers can very often be repaired by replacing the central electrode. Those electrodes are available from the Victoreen Company.