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<p>Hi everybody,</p>
<p>I am using Gate for my thesis project and now I am doing some simulations with a Derenzo phantom. I have a question about the expected number of coincidences. I am doing some short simulations just to understand how it works so I have 1s of time with 28
different sources of 5000 Bq each one. At the end of the simulation on the ROOT output I can see that we have about 22000 singles but just 1468 concidences, while I expected about 11000. Maybe the problem is the digitizer setting so I enclose that part of
the code. </p>
<p><br>
</p>
<p></p>
<div># A D D E R<br>
/gate/digitizer/Singles/insert adder<br>
<br>
<br>
# R E A D O U T <br>
/gate/digitizer/Singles/insert readout<br>
/gate/digitizer/Singles/readout/setDepth 1<br>
<br>
<br>
# E N E R G Y B L U R R I N G<br>
/gate/digitizer/Singles/insert blurring<br>
/gate/digitizer/Singles/blurring/setResolution 0.26<br>
/gate/digitizer/Singles/blurring/setEnergyOfReference 511. keV<br>
<br>
<br>
# E N E R G Y C U T<br>
/gate/digitizer/Singles/insert thresholder<br>
/gate/digitizer/Singles/thresholder/setThreshold 250. keV<br>
/gate/digitizer/Singles/insert upholder<br>
/gate/digitizer/Singles/upholder/setUphold 750. keV<br>
<br>
<br>
# D E A D T I M E <br>
/gate/digitizer/Singles/insert deadtime<br>
/gate/digitizer/Singles/deadtime/setDeadTime 2.2 mus<br>
/gate/digitizer/Singles/deadtime/setMode paralysable<br>
/gate/digitizer/Singles/deadtime/chooseDTVolume block<br>
<br>
<br>
# C O I N C I S O R T E R <br>
/gate/digitizer/Coincidences/setWindow 24. ns<br>
/gate/digitizer/Coincidences/MultiplesPolicy takeAllGoods<br>
/gate/digitizer/Coincidences/setOffset 0. ns<br>
/gate/digitizer/Coincidences/describe<br>
<br>
/gate/digitizer/name delay<br>
/gate/digitizer/insert coincidenceSorter<br>
/gate/digitizer/delay/setWindow 24. ns<br>
/gate/digitizer/delay/setOffset 500. ns<br>
/gate/digitizer/delay/describe<br>
<br>
<br>
/gate/digitizer/name finalCoinc<br>
/gate/digitizer/insert coincidenceChain<br>
/gate/digitizer/finalCoinc/addInputName delay<br>
/gate/digitizer/finalCoinc/addInputName Coincidences<br>
/gate/digitizer/finalCoinc/usePriority true<br>
/gate/digitizer/finalCoinc/describe<br>
</div>
<p></p>
<p><br>
</p>
<p><br>
</p>
<p>Thank you for your disposability</p>
<p>Best regards</p>
<p>Mattia<br>
</p>
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