<div dir="ltr">Gate users,<div><br></div><div>I am simulating an alpha source hitting a scintillator sheet. With my simple geometry of just the scintillator and pmt, the hits in my Hits.dat data file corresponded to optical photons that crossed into my pmt, which had the perfect_apd surface. However now when I add another volume I designated as 'Foil' that is above my scintillator and pmt, all of the 'hits' in my Hits.dat file correspond to optical photons entering my Foil volume, even though I did not specify its surface to be a dielectric_metal surface of any kind. </div>
<div><br></div><div>Is there a reason why this is happening? Just by adding this foil above my scintillator layer, I am no longer getting any optical photons reaching my pmt, when I was hoping the foil would act as a reflector, and reflect optical photons down towards the pmt.</div>
<div><br></div><div><br></div><div>Thank you,</div><div><br></div><div>-Amy</div></div>