Recalibration of P-2 standard ionization chamber
Abstract
Experimental and analytical techniques are described which permitted recalibration of the P-2 chamber's monoenergetic sensitivity based upon combined responses from a set of bremsstrahlung measurements, monoenergetic isotopic source measurements, and a monoenergetic gamma radiation produced by inelastic proton scattering. A novel technique is described for combining simultaneous knowledge of bremsstrahlung and monoenergetic response measurements with a statistically determined least structures constraint. The experimental details, analytical procedures, and resulting calibration of the standard P-2 ionization chamber from 100 keV to 20 MeV are presented and compared with previous determinations of the P-2 chamber sensitivity. Differences of approximately 15% between the derived sensitivity and the previously accepted values were observed in the region between 1.5 and 6 MeV.
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