Beta-energy response of the Eberline RO-7 survey instrument

Technical Report · Sun Oct 10 04:00:00 EDT 1982

DOI:https://doi.org/10.2172/6733025· OSTI ID:6733025

Hankins, D E

An RO-7 radiation survey instrument was obtained from the Eberline Instrument Corporation to use in a study of the beta dose rates from the Godiva IV Critical Assembly at Los Alamos National Laboratory. A limited evaluation of the instrument was performed, and its energy dependence for beta particles was determined. The RO-7 instrument is a hand-held, cutie-pie-style survey meter with a liquid crystal digital readout. The instrument is available with three interchangeable ion chamber probes, although we used only the midrange probe (RO-7-BM) in this study. The midrange probe has a full-scale range of 199.9 R/h and a resolution of 0.1 R/h. The ion chamber has a 1-in.-diameter entry window 2 mils thick (approx. 7 mg/cm/sup 2/) of aluminized mylar. The chamber is lined with phenolic nominally 1/8 in. thick. The housing is nominally 60 mils thick. The chamber's internal dimensions are 1-in. diameter x 0.6-in. length (2.5 cm x 1.5 cm) with a sensitive volume of 7 cm/sup 3/. The beta shield is a plastic cap (approx. 1000 mg/cm/sup 2/) over the beta window and is held in place over the probe by an O-ring. The overall dimensions of the basic probe are 1.5 in. x 4.2 in. The weight of the instrument with the midrange probe is 3.2 pounds (1.5 kg). The batteries are three 9-V and two 30-V cells with an operating lifetime of 160 hours (for the 9-V cells). The overall unit is 9.5 in. high, 4.25 in. wide and 13.5 in. long when the probe is attached.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6733025
• Report Number(s): UCID-19484; ON: DE83003108
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BETA DOSIMETRY
DOSE RATES
DOSIMETRY
ENERGY DEPENDENCE
FUNCTIONS
GAMMA DOSIMETRY
IONIZATION CHAMBERS
MEASURING INSTRUMENTS
MONITORS
PERFORMANCE TESTING
RADIATION DETECTORS
RADIATION MONITORS
RESPONSE FUNCTIONS
SENSITIVITY
SURVEY MONITORS
TESTING