==== Agenda for radiogenic working group meeting on July 25, 2013 ====
  - (a,n) calculation for Th228 and Radon decay chain (Chao)
  - Detailed comparison to include the differential cross section for SOURCE calculation using the (a, n) neutron yield cross section provided by Chao in Copper (Silvia & Huang)
  - Radiogenic background (external) data sheet for Homestake Mine (Jason, Iseley, Wenzhao)
  - Validation of (a, n) calculation using AmBe measurement in SOURCES code (Jodi)

==== Meeting notes ====
Participants: Chao Zhang, Wenzhao Wei, Jason Goon, Iseley Marshall, Silvia, Hang Qiu 


Summary notes:

   * Chao completed calculation of (a,n) neutron yield for all materials from Th228 decay chain. He will apply it to Radon decay chain and represent the results at next meeting.   
   * According to the discussion, Silvia will include the comparison of the (a,n) differential cross section between SOURCES and TALYS for Copper target. 
   * For the background data sheet, Jason is doing the measurement using the germanium detector at 4850ft level right now. He promise to present part of results by next meeting. 
   * Silvia will report the validations of SOURCES code by next meeting.