<div dir="ltr"><div>The material definition of LYSO in GateMaterials.db is incorrect, particularly the density of 5.37 g/cm3 is a lot lower than the typical value of ~7.1-7.4. I'm not sure why this is the case, but it appears the file has not changed since the the earliest version of Gate. I'm using this definition (courtesy Marc Chamberland):<br>
<div>
<div><span class="">LYSO</span>: d=7.36 g/cm3; n=4 ; state=Solid</div>
<div> +el: name=Lutetium ; f=0.714467891</div>
<div> +el: name=Yttrium ; f=0.04033805</div>
<div> +el: name=Silicon; f=0.063714272</div>
<div> +el: name=Oxygen; f=0.181479788</div>
<br></div><div>That should resolve any significant difference between LYSO and LSO.<br></div><br></div>Best of luck!<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Mar 8, 2014 at 9:07 PM, 张春晖 <span dir="ltr"><<a href="mailto:arnoxiaolei86@gmail.com" target="_blank">arnoxiaolei86@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello everyone:<br>
I did two experiments using GateV6.2, The conditions of these<br>
two experiments are same with each other except the material of the<br>
crystal (using LSO in first experiment and LYSO in secone one), but<br>
the Coincidences number recorded in the first experiment is treble as<br>
many as that recorded in the second experiment. What a bad performance<br>
of LYSO! Can anyone tell me why? The macros are in the attachment.<br>
Thanks a lot!--Chunhui Zhang<br>
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