B Floor sample

1. B Floor sample

2. Blips in images, caused by foam de-gassing – charge effects.

5. B C A

6. Similar magnification for the two filters B Floor J Floor Many more particles on the B floor filter

8. A b e a d c

9. b e S Cl Mg Mg Ca Cl Fe K S e a b a Cl d d Cl c c Mg Cl Mg

10. B C A

12. a c d b f g h e

13. a c d b f g h e Si a d Cl C b Ca Si Fe Ca K Si S Fe e Cl c Si C Ca Al S K Ca K Cl Fe Si g f h Si Al Al K C Si C C K Ca Ca Cl Cl Ca Fe Fe

14. B C A

15. C

16. a b g e d c f

17. a a b g e d c f g Ca g Si Cl Al S Si b C e O d Ba Si f Si C c Al S K Ca O

18. Overview - after

19. Overview-after

20. Particle Size: Many sub micron, quite a lot >10um, some extending more than 50um Particle Composition: Much more varied. Same element as before, plus Ba.

21. Initial Comparison

22. C % is similar for both • Si % - much higher for the B floor sample • S % - variable – highest % on J • Na % - much higher for B floor sample • K % - generally low, not more than 2% • Ba % - much higher for B floor sample • P % - variable • Ca % - much higher for J floor sample • Cl % - one case of v.high % on B floor, otherwise low • Al % - generally low • O % - variable • Zn % - generally only present on B floor sample, but small quantities • N % - possibly more on the J floor sample….prob due to scarcity of particles and higher chance of interacting with gas in chamber