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Search for the Lost Information Through the Faces

Search for the Lost Information Through the Faces . Shahab khan. Objective: Account for the Signal. Quantify the amount of signal lost to the top and bottom faces of the cell. Radiation Source. Signal Lost through top face. Cross-talk. Cross-talk. Signal Lost through bottom face.

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Search for the Lost Information Through the Faces

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  1. Search for the Lost Information Through the Faces Shahab khan

  2. Objective: Account for the Signal • Quantify the amount of signal lost to the top and bottom faces of the cell Radiation Source Signal Lost through top face Cross-talk Cross-talk Signal Lost through bottom face To PMT

  3. Stack Cells one on top of the other Record the signal from each cell separately Account for the signal due to beta particles crossing over to the other cells Put it all together How can I find how much is lost?

  4. X = amount of light from bottom surface S = new light from betas to bottom cell (Source) C = cross-talk Y = signal read from top cell alone d1,d2,d3 are paint thickness A, R, and T are Absorption, Reflection, and Transmission coefficients Complicated Theory Source betas Y d1 X C d2 S d3

  5. Equations & Simplifications • T(d2)*X + R(d2)*X + A(d2)*X = X • Measurement from bottom cell gives: • S + T(d2)*X – X*C*T(d2)*X – f(X) • Possible Simplification: • A(d2)*X  A(d3)*X  0

  6. Series of Tests Test 1 Test 2 Test 3 Test 4 PMT PMT Optical paper PMT PMT

  7. The Data

  8. Conclusion • Not much is known to determine the exact amount of light lost • More studies should be done to determine the T, R, and A properties of the paint • However, it can be inferred that the light lost through the bottom face is enough to cause at least 40 nA, which is about 8 percent

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