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Mark S. Brown edited Other20mmResults.tex
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\subsubsection{Other LSO:CeCa 20mm Results}
In table \ref{tab:ctrfit-20-results} we again perform the two
fittings. polynomial fits. In this case both the fit to the intercept and to a linear relationship perform well.
We also see that Again the
peak-to-peak change standard deviation is on the
other order of the error in the
intercept values. From these second set of measurements we would intercept$_\text{notfit}$. We conclude no relationship between
the CTR and
the DOI
is evident, within error.
This is despite these measurements resulting in a a lower error per CTR measurement and a greater number of $\gamma\gamma$ events recorded; namely 5000 compared to 3400.
In figure \ref{fig:centroidposition-20} the same plateau as observed in the 30mm measurements is again seen. In this case the plateau is reached close to 10mm for the wrapped measurements. Again the peak to peak range in the delay peak centroid is comparable to the scintillator crystal length. We can conclude that the shift is predominantly dependent upon the geometry of the scintillator crystal.
In figure
\ref{fig:energyresolution-20} we see the energy resolution improve with increasing DOI. In figure \ref{fig:lightoutput-20} we see the right photopeak centroid with DOI.
We see that In this case the
energy resolution is poorest plateau commences at
low DOI; (or near to) 10mm. As this
despite has changed with scintillator crystal length the
light output being higher at low DOI. The improvement in geometry is clearly the
energy resolution from unwrapped primary contribution due to
wrapped is as expected corresponding this effect. The peak to
peak ranges are different between configurations. Namely 120$\pm$12ps, 162.2$\pm$1.7ps and 130.7$\pm$1.5ps for the
increase in unwrapped, partially wrapped and wrapped configurations. In the
light output. As 30mm case these values are 227.9$\pm$2.5ps and 223.3$\pm$2.5ps for the
increase in unwrapped and wrapped configurations respectively. We conclude two things:
\begin{enumerate}
\item Larger peak to peak range on the
light output partially wrapped case is
large when covering the face opposing due to...
\item The unwrapped and wrapped configurations have the
photodetector, it is clearly important that in real usage it is ensured that a proper PTFE wrap is in place same peak to
maximise timing and energy performance. peak range because...
\end{enumerate}