<div dir="ltr">That peak is the peak of the beta spectrum that you're seeing. Because you're viewing the singles data, you'll always see the beta and gamma events in your crystal volume. By running in coincidence mode, your spectrum should look more like what you find in my thesis.<div><br></div><div>-Bryan<br><div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 7, 2015 at 8:51 PM, wugc <span dir="ltr"><<a href="mailto:wuguocheng@neusoft.com" target="_blank">wuguocheng@neusoft.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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<div style="FONT-FAMILY:华文仿宋;FONT-SIZE:12pt"><span>Dear:
</span>
<div style="FONT-FAMILY:华文仿宋;COLOR:#000000;FONT-SIZE:12pt">
<p style="MARGIN:0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE:15pt" lang="EN-US"><font face="Calibri">Thank you for your reply and paper, I try to
simulation the system using GATE, But I find the Intrinsic Activity Single
events energy spectrum as follows, I'm not sure why appear the 630keV
photopeak???<u></u><u></u></font></span></p></div></div>
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<div>Kind
regards,</div>
<div style="TEXT-INDENT:2em;FONT-FAMILY:华文仿宋;FONT-SIZE:12pt"> </div>
<div>2015-05-08</div>
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<div style="COLOR:#c0c0c0">Wu Guocheng
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