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--></style></head><body lang=EN-US link=blue vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Fellow Gate Users, <br><br>I’m using an ion source to simulate the decay of I131, but would like to glean more information from the root file. By simply navigating the TBrowser as demonstrated in the Gate User’s manual, I can see things such as what particles were generated, as well as particle energies:<br><br><img width=452 height=294 style='width:4.7083in;height:3.0625in' id="Picture_x0020_3" src="cid:image003.png@01D5D611.011E51D0"><img width=654 height=311 style='width:6.8125in;height:3.2395in' id="Picture_x0020_4" src="cid:image005.jpg@01D5D611.011E51D0"></p><p class=MsoNormal>This is nice, because I can basically see that the 364 keV gamma peak of Xe*131 (bi-product from 131I decay) is very prominent, beta energies up to 606 keV, small gamma peak of 723 keV. Moreover, a look at a secondary production graph accessible through the TBrowser is also revealing that the proper decay processes are occurring. Note the presence of Xe-131, betas, and decay gamma particles. (That’s 10^3 on the y-axis) <br><img width=627 height=311 style='width:6.5312in;height:3.2395in' id="Picture_x0020_5" src="cid:image008.png@01D5D611.011E51D0"> </p><p class=MsoNormal>So everything seems to be in order. About the same number of gamma decay particles are shown in the bottom graph as the above graphs…<br><br>BUT what I’d like to see is a harmony of these informations. How could I, for example, see a histogram of gamma particles and energy? Or beta particles and energy? I’ll continue to check the root help files for how to do this, but hopefully someone has experience with this!! <br><br>Thanks in advance!</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>