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Coating Comparison of Au to Al + C

Coating Comparison of Au to Al + C. Au coat. Th M4-N3. Pb M4-O2. Pb M β. Pb M α. Au M β. Au M3-N4. Th M ζ 2. Au M γ. Th M ζ 1. La L β (2). Pr L α (2). Ce L α (2). La L α (2). Au coat compared to Al+C. Th M4-N3. Pb M4-O2. Pb M β. Pb M α. Au M β. Au M3-N4. Th M ζ 2.

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Coating Comparison of Au to Al + C

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  1. Coating • Comparison of Au to Al + C

  2. Au coat Th M4-N3 Pb M4-O2 Pb Mβ Pb Mα Au Mβ Au M3-N4 Th Mζ2 Au Mγ Th Mζ1 La Lβ (2) Pr Lα (2) Ce Lα (2) La Lα (2)

  3. Au coat compared to Al+C Th M4-N3 Pb M4-O2 Pb Mβ Pb Mα Au Mβ Au M3-N4 Th Mζ2 Au Mγ Th Mζ1 20% increase in counts La Lβ (2) Pr Lα (2) Ce Lα (2) La Lα (2) Au Al + C

  4. Au coat compared to Al+C Th M4-N3 Pb M4-O2 Pb Mβ Pb Mα Au Mβ Au M3-N4 Th Mζ2 Au Mγ Th Mζ1 La Lβ (2) Pr Lα (2) Ce Lα (2) La Lα (2)

  5. Au coat compared to Al+C Th M4-N3 Pb M4-O2 Pb Mβ Pb Mα Au Mβ Au M3-N4 Th Mζ2 Au Mγ Th Mζ1 La Lβ (2) Pr Lα (2) Ce Lα (2) La Lα (2)

  6. GSC 8153 Pb region (PET) – Au coat 100Å Au note

  7. GSC 8153 Pb region (PET) – Al+C coat 200Å Al and 80Å C

  8. 2) Background Curvature Effect on net intensity of PbMα

  9. GdPO4 Pb region (PET) PbMα

  10. PbMα

  11. GSC 8153 scan vs GdPO4

  12. PbMα

  13. Error on PbMα from linear background ~30-50 Ma error on age at 1000ppm Pb

  14. Pb concentration vs. net intensity Black Hills, Leg 8

  15. 3) New VLPET Count rates and resolution

  16. New VLPET comparison Measured intensity PbMα on pyromorphite

  17. GSC 8153 Pb region VLPET SP3 VLPET SP4

  18. Th M4-N3 Pb M4-O2 Pb Mβ Pb Mα Th Mζ1 Th Mζ2 La Lβ (2) Pr Lα (2) Ce Lα (2) La Lα (2)

  19. GSC 8153 old VLPET (SP3)

  20. GSC 8153 new VLPET 10% improvement in pk/bkg

  21. Interference corrections Interferences on PbMα old VLPETnew VLPET Predicted* Measured reduced relative CF CF CF intensity (%) ThMζ0.33 0.41 0.36 12 YLγ0.70 0.88 0.827 LaLα0.14 0.18 0.02 89 *Based on increased count rate

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