A STANDARD SOURCE OF RADIATION FOR RADIAC DETECTORS. II. EXTENSION OF THE RANGE OF EXPOSURE-DOSE RATES AND THE NEW Cs-137 SOURCE

Technical Report · Mon Feb 01 04:00:00 EST 1960

OSTI ID:4167773

Nash, A E; Kunz, W E

Four facilities of similar design to produce standard gamma-ray fields have been constructed and calibrated at the U. S. Naval Research Laboratory for use with cobalt-60 and cesium-137 sources. These facilities provide four intensity ranges, two of which. the low and the medium ranges have previously been described and calibrated. The low range covers the region between background and 0.5 r/hr using interchangeable sources of Co-60. Cs-137, and Ra. The medium range. using Co-60, extends the field to 50 r/hr. The two new higher ranges extend the exposure-dose rate for the Co-60 source (150 curies) in one case and introduce a new source of Cs-137 (100 curies) in the other. The range of calibrated gammaray intensity now includes the region from background to over 2000 r/hr for Co-60 and to 800 r/hr for Cs-137. In addition to the calibration of the two new facilities. the older medium range has been recalibrated using a carbon ionization chamber, for which a calibration procedure has been adapted from a standard procedure. The two new sources are being used in conjunction with the new 300-kev x ray facility at NRL to provide energy calibration points for energy-dependence measurements. (auth)

• Research Organization: Naval Research Lab., Washington, D.C.
• NSA Number: NSA-14-015157
• OSTI ID: 4167773
• Report Number(s): NRL-5462
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BACKGROUND
CARBON
CESIUM 137
COBALT 60
EFFICIENCY
ENERGY
GAMMA RADIATION
GAMMA SOURCES
IONIZATION CHAMBERS
MEASURED VALUES
NRL
PHYSICS
RADIATION DETECTORS
RADIATION DOSES
RADIATION SOURCES
RADIUM
STANDARDS
X RADIATION