1 / 22

Radioactivity measurement by HPGe detector I

Radioactivity measurement by HPGe detector I. T.Sato For XMASS meeting 17 th Oct. 2005. Energy calibration New & Old KOV measurement Summary. 1.Energy calibration( 57 Co). 60sec data. 14.1kBq. 122keV. 136keV. 1.Energy calibration( 133 Ba). 60sec data. 15.7kBq. 276keV. 303keV.

serena
Download Presentation

Radioactivity measurement by HPGe detector I

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Radioactivity measurementby HPGe detectorI T.Sato For XMASS meeting 17th Oct. 2005 Energy calibration New & Old KOV measurement Summary

  2. 1.Energy calibration(57Co) 60sec data 14.1kBq 122keV 136keV

  3. 1.Energy calibration(133Ba) 60sec data 15.7kBq 276keV 303keV 81keV 356keV 384keV

  4. 1.Energy calibration(137Cs) 60sec data 18.7kBq 662keV

  5. 1.Energy calibration(60Co) 60sec data 16.3kBq 1173keV 1333keV

  6. 1.Energy calibration Y(keV) = P1 + P2 x X(channel) P1 = (0.34783 ± 0.86422)×10-2 P2 = 0.40051 ± 0.00001 ~0.4keV/channel

  7. 1.Energy calibration

  8. 2.New & Old KOV measurement

  9. Estimation of radioactivity 60Co : 1173keV 99.97% 1333keV 99.99% 40K : 1461keV 11% U-chain : 214Pb 295keV 19.3% 214Pb 352keV 37.6% 214Bi 609keV 46.1% 214Bi 1120keV 15.1% 214Bi 1764keV 15.4% Th-chain: 212Pb 239keV 43.3% 228Ac 338keV 11.3% 208Tl 511keV 22.6% 208Tl 583keV 84.6% 228Ac 911keV 25.8% 228Ac 969keV 15.8% 208Tl 2615keV 99%

  10. Analysis plot KOV-NEW(1173keV) (count/sec) Peak area P0 fit

  11. 3.Summary plot 1 OLD NEW ×10-3 ×10-3

  12. 3.Summary plot 2 OLD NEW ×10-5 ×10-5

  13. Peak detection efficiency OLD NEW (Fe=54%,Ni=29%,Co=17%) Point like Air(50mm*50mm*6mm) Kov(50mm*50mm*6mm) Point like Air(50mm*50mm*1mm) Kov(50mm*50mm*1mm) Air&Kov 1e4 events@each point Air&Kov 1e6 events@each point Error = 0.44%@609keV(kov) Error = 3.85%@609keV(kov)

  14. Interaction probability in KOV(6mm) (%) ((air_eff – kov_eff) / air_eff)*100 Interaction probability

  15. 3.Summary plot 3(=plot 2 /eff) OLD NEW ×10-3 ×10-3 No big difference

  16. 3.Summary • Old and New KOV measurement by HPGe. • There is no big difference, but new kov has a low Co content than old one. To Do • Analysis about another samples, especially about 40K in PMT parts or One PMT.

  17. 2.New & Old KOV measurement OLD NEW Data Data BG BG

  18. 2.New & Old KOV measurement OLD NEW

  19. 2.New & Old KOV measurement OLD NEW

  20. 2.New & Old KOV measurement OLD NEW

  21. 2.New & Old KOV measurement OLD NEW

  22. 2.New & Old KOV measurement OLD NEW

More Related