<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Dear users</div><div dir="ltr" data-setdir="false">I'm using a positron source with half-life of less than 1 second in my CPET program.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">SetForcedHalfLife 0.001 s</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">The problem is, for HalfLife less than 1 second, I have Singles and Hits but the Coincidences file is empty. If I increase the Half-life bigger than 1 s, the program works and I have <span><span style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">Coincidences. Please let me know, is there a limit on the amount of Half-life?</span></span></div><div dir="ltr" data-setdir="false"><span><span style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">What is the solution?</span></span></div><div dir="ltr" data-setdir="false"><span><span style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">Best regards</span></span></div><div dir="ltr" data-setdir="false"><span><span style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">Zahra</span></span></div></div></body></html>