Case study
bttk20032004
HLT555.v10R.docx
Exposure Assessment Case Study
(50 points)
Directions: After reading the Centers for Disease Control and Prevention case study, answer the following questions.
Case Study: “Cross-sectional Exposure Assessment of Environmental Contaminants in Churchill County, Nevada” by the Centers for Disease Control and Prevention.t http://www.cdc.gov/nceh/clusters/fallon/factsheet.pdf
Identify the agent:_____________________________________________________
What type of agent is described?
chemical
Source:
anthropogenic non-anthropogenic
area point
stationary mobile
indoor outdoor
Transport/carrier medium:
air
water
soil
dust
food product item
Exposure pathways:
eating contaminated food
breathing contaminated air
touching a contaminated surface
drinking contaminated water
Exposure concentration:
mg/kg (food) mg/litre (water)
ug/m3 (air) ug/cm3 (contaminated surfaces)
% by weight fibres/m3 (air)
Exposure route:
inhalation dermal contact
ingestion multiple routes
Exposure frequency:
continuous intermittent
cyclic random
rare
Exposure duration:
seconds minutes
hours days
weeks months
years lifetime
Exposure setting:
occupational non-occupational
residential non-residential
indoors outdoors
Exposed population:
general population
population subgroups
individuals
Geographic scope:
site specific
local regional
national international
global
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