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Lab calibration measurements with radioactive sources Julia Rietenbach 28. August 2012 Julia Rietenbach () Lab calibration measurements with radioactive sources 28. August 2012 1 / 17 Contents Motivation 1 Calibration Sources 2

SLIDE 1

Lab calibration measurements with radioactive sources

Julia Rietenbach

28. August 2012

Julia Rietenbach () Lab calibration measurements with radioactive sources

28. August 2012

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SLIDE 2

1

Motivation

2

Calibration Sources

3

Calibration measurements

4

Summary and Outlook

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SLIDE 3

Motivation for the measurements

Chip had taken data during Test Beam Pixel are not calibrated → position of the Landau distribution varied from pixel to pixel

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Motivation for the measurements

Chip had taken data during Test Beam Pixel are not calibrated → position of the Landau distribution varied from pixel to pixel Each pixel needs to be calibrated individually → a lot of statistic is needed

Julia Rietenbach () Lab calibration measurements with radioactive sources

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Motivation for the measurements

Chip had taken data during Test Beam Pixel are not calibrated → position of the Landau distribution varied from pixel to pixel Each pixel needs to be calibrated individually → a lot of statistic is needed Use sources in the lab to calibrate the pixel

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Motivation for the measurements

Chip had taken data during Test Beam Pixel are not calibrated → position of the Landau distribution varied from pixel to pixel Each pixel needs to be calibrated individually → a lot of statistic is needed Use sources in the lab to calibrate the pixel Raw Test Beam data can be recalibrated; TOT ↔ dE

dx

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SLIDE 7

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SLIDE 8

Calibration Sources

Source Radiation Energy (keV) Intenstity (%) Source Radiation Energy (keV) Intenstity (%) Fe 55 Gamma/Xray 5,888 8,20 Cs 137 Beta 174,320 94,70 5,899 16,20 416,260 5,30 6,490 1,89 Sr 90 Beta 195,800 100,00 Electron 3,670 7,40 Am 241 Alphas 5388,000 1,66 26,400 0,78 5442,800 13,10 624,216 7,79 5485,560 84,80 655,668 1,40 5511,500 0,23 660,364 0,30 5544,500 0,37 Gamma/Xray 4,470 0,91 Electron 76,543 0,23 31,817 1,99 32,194 3,64 Gamma/Xray 13,900 37,00 36,304 0,34 26,345 2,27 36,378 0,67 59,541 35,90 37,255 0,21 C 14 Beta 49,470 100,00 661,657 85,10 Julia Rietenbach () Lab calibration measurements with radioactive sources

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SLIDE 9

Calibration Sources

Source Radiation Energy (keV) Intenstity (%) Source Radiation Energy (keV) Intenstity (%) Cd 109 Electrons 2,610 167,10 Co 57 Electron 0,670 251,00 18,500 20,80 5,620 105,10 62,520 41,70 7,301 71,10 84,228 44,00 13,567 7,40 87,316 8,90 114,949 1,83 87,938 1,60 121,215 0,19 129,362 1,30 Gamma/Xray 2,980 10,30 Gamma/Xray 0,700 1,52 21,990 29,80 6,391 16,6 22,163 56,10 6,404 32,9 24,912 4,80 7,058 3,91 24,943 9,2 7,058 2,00 25,455 2,31 14,413 9,16 88,033 3,70 122,061 85,60 136,474 10,68 Julia Rietenbach () Lab calibration measurements with radioactive sources

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Absorption in Silicon

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Frames of different particle types

Am 241 α Source Am 241 γ Source Fe 55 Source Cd 109 Source Cs 137 Source

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Laboratory

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Laboratory

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Calibration measurements

Already finished most of the measurements Statistics for different sources:

◮ Am 241 gamma: all: 70052360 entries; single pixel: 43037750 entries ◮ Fe 55: all: 45305420 entries; single pixel: 44670740 entries ◮ Cd 109: all: 30787630 entries; single pixel: 20522860 entries

next step fit peak for every pixel

◮ Stephane wrote a program which finds the peak automatically and

makes the fit

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Single pixel occupancy for different Source

Calibration measurment → noisy pixel on diagonal?

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TOT Spectrum from pixel on diagonal

normal physics events → no noise

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TOT Spectrum of a single pixel

noise peak always in the lowest entries to small to get masked → physical events still measurable

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Summary and Outlook

Calibration measurements are mostly finished Continue the analysis, next steps will be

◮ use Stephane’s program to fit peak of each single pixel for the different

sources

◮ Cross check the results with Am 241 α and Sr 90 source ◮ recalibrate the test beam data Julia Rietenbach () Lab calibration measurements with radioactive sources

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