"Atometer" Colorimetric Dosimeter (ca. 1952-1955)

The Atometer was a simple colorimetric dosimeter manufactured by Magnex Corporation of Jamaica, New York.

The instructions on the side read: "After an atom bomb explosion to determine the degree of exposure to gamma radiation:

  1. Tear lemon yellow control panel and inner lead foil wrapper.
  2. Compare color of liquid with control panel and with color bands.
  3. Scratch a check mark on matching color band or control panel.
  4. Close panel and avoid exposing liquid to light."

Control Panel color bands

Golden Yellow: 50R
Orange: 150R
Orange Red: 400R
Red: 600R

Size: 2.25” x 0.75”

Weight: 1 oz

Donated by Jack Greene.


  • Nucleonics. August 1952, p 84.
  • Atomic Energy Commission Radiation Measuring Instruments, RIB-8 (supplement 2) July 1, 1954, page BFC-1A.