THE POCKET DOSIMETER

Journal Article · Fri Dec 01 00:00:00 EST 1961 · Ann. Occupational Hyg.

OSTI ID:4731720

Ryder, R E

Relative advantages of the pocket dosimeter and the film badge are cited and a dosimeter (Cintel-Kershaw) is described. The pocket dosimeter is the size of a fountain pen and comprises a small ionization chamber, to the inner electrode of which is attached a gilded quartz fiber in the form of a hairpin movement. It has a rubber end-cap that can be removed to enable the instrument to be charged by the now exposed electrode system. The natural leakage (leakage in absence of radiation) is so low that it is permissible to issue the dosimeters to workers in laboratories fully charged on Monday mornings, and collect them for recharging at the end of the week. The dosimeters normally have a range either from 0 to 200 or 0 to 500 Mr, but higher range instruments are available with ranges 0 to 5 r. The standard pocket dosimeter is sensitive to gamma radiation only; however, it is possible to make thin-walled chambers that are sensitive to BETA -radiation, but these are naturally fragile. Dosimeters sensitive to slow or thermal neutrons are similar to those described and are used in the same way except that the electrode system is coated with a small amount of boron, either natural, or enriched with B/sup 10/. Procedures for charging and reading dosimeters and protecting them from moisture, changes in temperature, and various means of accidental discharge are outlined. (H.H.D.)

• Research Organization: Rank Cintel Ltd., London
• NSA Number: NSA-17-018611
• OSTI ID: 4731720
• Journal Information: Ann. Occupational Hyg., Vol. Vol: 4; Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

INSTRUMENTS AND INSTRUMENTATION
BACKGROUND
BERYLLIUM 10
BETA PARTICLES
BORON
COATING
DOSEMETERS
ELECTRIC DISCHARGES
ELECTRODES
FIBERS
FILM BADGES
GAMMA RADIATION
HUMIDITY
IONIZATION CHAMBERS
NEUTRON DETECTION
PHOTOGRAPHIC FILM
QUARTZ
RADIATION DOSES
RUBBER
SEALS
SENSITIVITY
TEMPERATURE
THERMAL NEUTRONS