quartz fiber electroscope dosimeter
Date1930-1945
Inventory NumberVT4788
ClassificationDosimeter
Subject
Maker
Fred C. Henson Company
fl. 1947 – 1955
Cultural Region
Place of Origin
Dimensions9 x 23.5 x 6.5 cm (3 9/16 x 9 1/4 x 2 9/16 in.)
Material
DescriptionUsed for dosimetry. It contains a small ionization chamber with charged surfaces, and a quartz fiber that deflects in proportion to the electric charge. This fiber forms an indicator that can be seen through a lens. The instrument is mounted on a specially designed stand.
Signedon plaque: QUARTS FIBER / ELECTROSCOPE / PAT. NO. 2022117 / MODEL 1 DER. NO. 33 / FRED C. HENSON CO. / PASADENA, CALIF. U.S.A
FunctionThis is a portable dosimeter. Its main advantage is that it does not need an external reader. As with other dosimeters, it contains a small ionization chamber with charged surfaces. In quarz fiber electroscopes, the ionization chamber includes a quartz fiber that deflects in proportion to the electric charge remaining on the surfaces, which diminishes with exposure to radiation by the migration of the generated ions. The fiber is part of an indicator that is seen through a lens.
ProvenanceFrom the Harvard Medical School.
Harold C. Ernst
Date: 1900-1930
Accessories: leveling screw
Object number: 1996-1-0178
B.A.S.F. Ammoniaklaboratorium
Date: 1932-1935
Accessories: 2 cases: a felt-lined silver metal tube and a larger brown cardboard tube
Object number: 1996-1-0725
Designs for Vision, Inc.
Date: circa 1975
Accessories: Spare metal handle for adjusting the lamp.
Object number: 2009-1-0013
Harvard University Department of Physics
Date: 1937
Accessories: white cardboard box with metal reinforcements
Object number: 2002-1-0042
Date: circa 1930
Object number: 2002-1-0043
Date: circa 1915
Object number: 2002-1-0044