Alpha counters for low background measurement

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Presentation transcript:

Alpha counters for low background measurement Moo Hyun Lee 1st alpha meeting 2014.12.19

Alpha counters status (MooHyun Lee) Alpha counter types and status ZnS + Plastic Scintillator counter Handheld alpha counter Eljen EJ-440 (12”x12” sheet) 2 each delivered. Silicon sensor (KNU) A prototype was made and tested. 18.5% FWHM with Am-241 with an air gap Ultralo-1800 (XIA) Ionization chamber with Argon gas and no window. Test material dimension: up to 1800 cm^2. Can separate signals from the chamber. ~80 k USD including training Ordered to have it shipping at the end of March 2015 Proportional wire chamber S/N is big Mylar window Background from the chamber can not be separated Well type Ge detector CsI crystal detector (thin and wide) 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) EJ-440 (ZnS) delivered 12” x 12” 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

ZnS detector design and readout example From an article in Progress in NUCLEAR SCIENCE and TECHNOLOGY, Vol. 1, p.194-197 (2011) (S.K.Lee et al.) 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

EJ-440 and BC-400 sandwich case B.K. Seo et al., in Transactions of the Korean Nuclear Society Spring Meeting Chuncheon, Korea, May 25-26 2006 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) Backup slides 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) Silicon sensor (KNU) A silicon PIN diode sensor has been developed and tested at KNU. Excellent experiences with the solid state detectors compared to the gas detector in general. Enough experiences in KNU. From DongHa Kah’s slide 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) Silicon sensor test (KNU) 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) XIA UltraLo-1800 counter Alpha Particle Counter 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) UltraLo-1800 Specification 1 – Sample assumed to be 300mm wafer (count times drop by factor of 2.5 when using max sample area) 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) UltraLo-1800 Schematic Overview 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) Proportional Counter Overview 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) UltraLo-1800 for different alphas locations 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)

Alpha counters status (MooHyun Lee) UltraLo-1800 requirements 2014-12-19 Alpha meeting Alpha counters status (MooHyun Lee)