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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Physics Seminar Speaker Series
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260915T155128Z
UID:tag:localist.com\,2008:EventInstance_45885459334710
DTSTART:20240326T203000Z
DTEND:20240326T220000Z
DESCRIPTION:"Health Physics and Environmental Resuspension of Radioactivity
 "\n\nPhysics Seminar Speaker Series: Professor Shaun Marshall\n\nSnacks at
  4:30 pm\, Talk begins at 4:45 pm\n\nHealth Physics is the science of radi
 ation safety which studies the beneficial uses of radiation while protecti
 ng people and the environment from its hazards. Following a contamination 
 event\, radionuclides can become airborne and will deliver an internal dos
 e of ionizing radiation when inhaled or ingested. Predicting the airborne 
 quantities which have resuspended from a deposition is complex given the n
 umber of factors which can influence the resuspension mechanism. The curre
 ntly accepted predictive model used by federal agencies\, the 2011 Maxwell
 -Anspaugh semi-empirical resuspension factor\, has limited applicability d
 ue to the basis data spanning a wide range of environments\, particulate s
 ources\, and nuclide species. This has motivated a recent effort to develo
 p a catenary compartment model to relate surface-to-air concentrations and
  characterize the resuspension kinetic rate constant. An in-house resuspen
 sion chamber was developed to probe air sampling times and protocols to qu
 antify resuspended particulates. Micron-sized Europium oxide powder was de
 posited on a concrete substrate and air was sampled at heights of 0.25 and
  1 meters using a low-volume air sampler. Air sampler filters were then an
 alyzed for mass using neutron activation analysis with delayed gamma spect
 roscopy. Results indicated substantially lower resuspension factors than t
 he historic data\, in agreement with the proposed catenary model. Addition
 ally\, lowering the sampler head from 1 to 0.25 meters appeared to signifi
 cantly enhance particulate collection\, suggesting a sensitive height dist
 ribution of particulates.\n\nShaun Marshall is a Visiting Assistant Profes
 sor of Physics at Mount Holyoke College and previously a Senior Staff Radi
 ation Scientist at Geosyntec Consultants\; he is an Associate Member of bo
 th the Health Physics Society and the American Academy of Health Physicist
 s.
GEO:42.257827;-72.573976
LOCATION:Cleveland Hall\, L-3
SUMMARY:Physics Seminar Speaker Series
URL;VALUE=URI:https://events.mtholyoke.edu/event/physics-seminar-speaker-se
 ries
CATEGORIES:Lectures & Presentations
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