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Large Volume Alpha/Beta Screener for Radon Daughter Plate-Out Studies at SDSM&T Juergen Reichenbacher AARM Workshop SDSM&T 05/21/2015.

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Presentation on theme: "Large Volume Alpha/Beta Screener for Radon Daughter Plate-Out Studies at SDSM&T Juergen Reichenbacher AARM Workshop SDSM&T 05/21/2015."— Presentation transcript:

1 Large Volume Alpha/Beta Screener for Radon Daughter Plate-Out Studies at SDSM&T Juergen Reichenbacher AARM Workshop SDSM&T 05/21/2015

2 - Concept and Prototype - Energy Calibration - Sample Screening OUTLINE

3 22-Apr-2015J. Reichenbacher (SDSM&T)3 LZ Cleanliness: Radon Plate-Out Studies at SDSM&T

4 22-Apr-2015J. Reichenbacher (SDSM&T)4 LZ Cleanliness: Radon Plate-Out Studies at SDSM&T Concept of Alpha-Beta-Radiation-Screener

5 22-Apr-2015J. Reichenbacher (SDSM&T)5 LZ Cleanliness: Radon Plate-Out Studies at SDSM&T Alpha-Beta-Radiation-Screener Prototype w/ one Si-Detector

6 22-Apr-2015J. Reichenbacher (SDSM&T)6 LZ Cleanliness: Radon Plate-Out Studies at SDSM&T Alpha-Beta-Radiation-Screener Electronics

7 22-Apr-2015J. Reichenbacher (SDSM&T)7 Inner Copper Cage for Screener oxygen-free high purity copper serves also as mechanical holder of detectors (-> defined thickness) Physics Design Course: Undergrad Jacob Wick

8 22-Apr-2015J. Reichenbacher (SDSM&T)8 Inner Copper Cage for Screener high-pressurized water jet cutter @ SDSM&T (w/ AMP Director Dr. Widener and T. Curtis):

9 22-Apr-2015J. Reichenbacher (SDSM&T)9 Alpha-Beta-Radiation-Screener: Signal Adding Benjamin Lynch (HV Splitterboxes and Signal Adding)

10 22-Apr-2015J. Reichenbacher (SDSM&T)10 Alpha-Beta-Radiation-Screener: Signal Adding Benjamin Lynch (HV Splitterboxes and Signal Adding)

11 22-Apr-2015J. Reichenbacher (SDSM&T)11 Alpha-Beta-Radiation-Screener: Signal Adding -> 0.17% precise resistors with nominal of 649 Ohm (paid only for 1% precision ;-)

12 22-Apr-2015J. Reichenbacher (SDSM&T)12 Alpha-Beta-Radiation-Screener: HV-Splitting

13 22-Apr-2015J. Reichenbacher (SDSM&T)13 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener

14 22-Apr-2015J. Reichenbacher (SDSM&T)14 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener

15 22-Apr-2015J. Reichenbacher (SDSM&T)15 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener

16 22-Apr-2015J. Reichenbacher (SDSM&T)16 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener FWHM 39 keV @ 5.16 MeV (better than Canberra spec of 75 keV for 5000mm 2 area and 500  m thickness) -> Reactor grade (not weapons grade)

17 22-Apr-2015J. Reichenbacher (SDSM&T)17 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener

18 22-Apr-2015J. Reichenbacher (SDSM&T)18 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener

19 22-Apr-2015J. Reichenbacher (SDSM&T)19 Calibration of Energy-Scale for Alpha-Beta-Radiation-Screener -> source made at reactor in 1940’ies (5 times half-life of Pu-241)

20 22-Apr-2015J. Reichenbacher (SDSM&T)20 Sample: Surface Counting of Unpolished Al-Plate w/ Alpha-Beta-Radiation-Screener

21 22-Apr-2015J. Reichenbacher (SDSM&T)21 Sample: Surface Counting of Glass Plate w/ Alpha-Beta-Radiation-Screener

22 22-Apr-2015J. Reichenbacher (SDSM&T)22 Current Chamber Background of Alpha-Beta-Radiation-Screener

23 Proof of Concept done! Very promising tool for LZ surface screening: Competitive with XIA ultralo-1800 (1 mHz of Po-210 per square meter) while providing more flexibility and no significant consumables needed (argon) Inner copper cage will improve sensitivity Can go underground at SURF and will get an active plastic scintillator veto to tag cosmics Can go into radon mitigated clean room at SDSM&T Thanks to State of South Dakota and SDSM&T for Start-Up Funds! 22-Apr-2015J. Reichenbacher (SDSM&T)23 Conclusion

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