APPENDIX F
ATOMLAB DOSE CALIBRATOR CALIBRATION
AND TRACEABILITY
This appendix describes the calibration procedures per-
formed on your Atomlab Dose Calibrator and their traceabili-
ty to the National Institute of Standards & Technology.
CALIBRATION & TRACEABILITY
The calibration of the Atomlab Dose Calibrators is directly
traceable to the National Institute of Standards &
Technology, formerly the National Bureau of Standards
(NBS). This is achieved through the establishment of a set
of working laboratory standards, the maintenance of these
working standards, and the use of these working standards
to calibrate each Atomlab Dose Calibrator.
The working standards consist of two ionization chambers
identical to the chambers used in each Atomlab Dose
Calibrator for radiation measurement, and several long-lived
radiation sources.
The two standard ionization chambers have been calibrated
using radionuclides that were calibrated by the National
Institute of Standards & Technology, generating response
numbers. These response numbers were then used to
determine the photon response function of the ionization
chambers. The shielding configuration is identical to that of
the Atomlab Dose Calibrator design.
The National Institute of Standards & Technology sources
are in glass ampule form and, because of the potential for
breakage, are not suitable for routine calibration. Instead the
working standards are in epoxy resin form in a plastic vial E
package. These standards have been calibrated against the
National Institute of Standards & Technology sources in the
ATOMLAB Dose Calibrator Operation Manual Appendix F
Biodex Medical Systems F-1 Release 2.0
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