NBS (National Bureau of Standards) measurement services: calibration of x-ray and gamma-ray measuring instruments. Final report

Technical Report · Mon Feb 29 23:00:00 EST 1988

OSTI ID:6997110

Lamperti, P J; Loftus, T P; Loevinger, R

The calibration and irradiation of x-ray and gamma-ray instruments are performed in terms of the physical quantity exposure. The calibrations are listed in NBS Special Publication 250 as calibrations 46010C through 46050S (formerly 8.3A through 8.3M). A calibration or correction factor is provided for radiation detectors, charge sensitivity of a high-gain electrometer is tested, and passive dosimeters are given known exposures. Calibration is performed by comparing the instrument against an NBS primary standard of exposure, which is a free-air chamber for x-rays and a cavity ionization chamber for cesium-137 and cobalt-60 gamma rays. A variety of quality-assurance checks are performed to assure the constancy of the standards and the accuracy of the calibrations and irradiations. The overall uncertainty is given as 0.7% for exposure rate in the NBS beams, 1% for calibration of a cable-connected chamber and irradiation of passive dosimeters, and 1.5% for calibration of a condenser chamber.

• Research Organization: National Bureau of Standards, Washington, DC (USA). Center for Radiation Research
• OSTI ID: 6997110
• Report Number(s): PB-88-211826/XAB; NBS/SP-250/16
• Country of Publication: United States
• Language: English

Related Subjects

440100* -- Radiation Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
DOCUMENT TYPES
DOSEMETERS
ELECTROMAGNETIC RADIATION
EQUIPMENT
GAMMA RADIATION
IONIZING RADIATIONS
LABORATORY EQUIPMENT
MEASURING INSTRUMENTS
MONITORS
NATIONAL ORGANIZATIONS
PROGRESS REPORT
QUALITY ASSURANCE
RADIATION DETECTORS
RADIATION MONITORS
RADIATIONS
STANDARDS
US DOC
US NBS
US ORGANIZATIONS
X RADIATION