Absorbed-dose calibration of ionization chambers in a (60)Co gamma-ray beam. Special pub. (Final)

Technical Report · Mon Oct 01 04:00:00 EDT 1990

OSTI ID:5992117

Pruitt, J S

Measurement Service C.1 from the National Institute of Standards and Technology (NIST) publication SP 250 provides calibrations for customer-owned ionization chambers so that they may be used to determine absorbed dose to water in (60)Co gamma-ray beams. The calibrations are based on calorimetric measurement of absorbed dose to graphite in a graphite phantom. Transformation of the calibrations to a water phantom is made with a specially-designed graphite ionization chamber, and requires knowledge of photon mass attenuation coefficients and the perturbation of the graphite chamber in the water medium. The determination of these quantities is described in detail, along with the operational techniques normally used to transfer the calibration to customer-owned chambers. Appendix A lists experimental data used to test the photon-fluence scaling theorem. Appendices B, C, and D describe international comparisons of the chamber calibrations, and Appendix E shows a sample calibration report.

• Research Organization: National Inst. of Standards and Technology (NML), Gaithersburg, MD (USA). Center for Radiation Research
• OSTI ID: 5992117
• Report Number(s): PB-91-132290/XAB; NIST/SP--250/40
• Country of Publication: United States
• Language: English

Related Subjects

440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
61 RADIATION PROTECTION AND DOSIMETRY
655003 -- Medical Physics-- Dosimetry
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIBRATION
CALORIMETERS
COBALT 60
COBALT ISOTOPES
COMPARATIVE EVALUATIONS
DOCUMENT TYPES
DOSEMETERS
DOSES
DOSIMETRY
GAMMA DOSIMETRY
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZATION CHAMBERS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATERIALS
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PROGRESS REPORT
RADIATION DETECTORS
RADIATION DOSES
RADIOISOTOPES
TISSUE-EQUIVALENT MATERIALS
WATER
YEARS LIVING RADIOISOT