1. May 31 Dugway ARD Fine two concentration trials
APS proportional reduction due to coincident counts above threshold
APS Alarm threshold confirmation ~2.7mg/m Thanks Dan!

3. Reproducible effect of E, A & B nozzles observed on 27 and 31 May
However, hypothesize greater %age difference between E & elbows on the 27May due to size distribution differences of native materials assuming not a concentration effect

4. Majority micron
Few small particles
Majority <10 micron
Large particle capture
large particle outside APS view
Majority of ARD distribution APS sees is within the APS upper size range albeit can escape capture without isokinetic nozzle. Just a few particles (diff of 5 & 20) can yield a significant and perhaps overshadowing signal.
Majority of ARD Fine distribution the APS sees is below 10micron with majority of large particles exceeding the APS linitation