Source flux accuracy from BLC analysis A. Strong MPE June 2002.

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Presentation transcript:

Source flux accuracy from BLC analysis A. Strong MPE June 2002

Evaluation of absolute flux determination accuracy BLC long-distance runs ISDC system spiros 3.3 IRFs from GSFC (old: isdc `7', new `11') singles+multiples various source angles compared to new beam monitor fluxes Details:

60 Co 1173 keV angle=0 run 31 previous result (Dec 2001): fluxes too low by factor ~0.74 Several factors in same direction now improve this: old IRF new IRF keV keV so extending energy range and new IRF gives 13.7% increase 13.7% increase Following corrections were not done before: correction for monitor (mask)-camera 1.71 m = 2.7% correction for divergence of beam ~ 2.7% New beam monitor analysis (David Attie): ~10% so combined factors increase factor from 0.74 to 0.97 i.e. Improvement, better consistency than expected from GSFC photopeak efficiency results from Dec 2001 meeting.

60 Co 1173 keV keV run angle spiros/monitor keV keV

241 Am 59 keV effect of IRF: keV run angle spiros flux old IRF new IRF angular dependence: keV new IRF run angle spiros/monitor (?) Low fluxes, consistent with GSFC photopeak efficiencies from Dec 2001 meeting

137 Cs 662 keV Run angle spiros flux monitor spiros/monitor (a) (b) a= with monitor mask-camera distance factor b= with also spiros beam divergence factor keV

24 Na 2754 keV spiros fluxes: Day 10 Day keV run angle spiros monitor spiros/monitor (a) (b) a= with monitor mask-camera distance factor b= with also spiros beam divergence factor