Perrygtaf Giannini Controls Corporation Radiation Dose Guide

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Country of manufacture: USA,            Date of manufacture: >= 1962
Diameter: 16.5 cm,          Thickness: 0.2 cm,           Weight: 25.9 gms
Materials: Cardboard;           Cursor: no cursor
Scales: 5
Front: Outer Disk: Radioisotope, Dose Rate Constant, Middle Disk: Gamma Ray Source Strength, Exposure Dose, Inner Disk: Exposure Time
Back: Table: Cosmic Rays in Rads/Yr at various heights above sea level, Table: Earth Radiation in Rads/Yr for various types of soil material.
Gauge Marks: [       ]
Condition: C3 (Signs of Very Minimal Use)
Came with: original paper mailing envelope

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