wk _ 15 risk assessment
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Topics
Risk Assessment chapt 04
Introduction
Risk assessmentHazard IdentificationDose Response AnalysisExposure assessmentRisk characterization
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All substances are poisons there isnone which is not poison . The rightdose differentiate a poison and aremedy. One of the most important change
in the environmental policy in the1980s was the ACCEPTANCE of therole of risk assessment and riskmanagement in environmentaldecision making
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Risk assessment is the determination of quantitativeor
qualitativevalue of risk related to a concrete situationand a recognized threat(also called hazard).
In other words the probability that exposure of some number of
people to some combination of chemicals will cause some responsesuch as cancer, birth defects, neurological damage.National academy of sciences in 1983 suggested thatrisk assessment can be divided into four steps
Those four steps in risk assessment are: Hazard Identification Dose Response Analysis Exposure assessment Risk characterization
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http://en.wikipedia.org/wiki/Quantitative_propertyhttp://en.wikipedia.org/wiki/Qualitative_datahttp://en.wikipedia.org/wiki/Threathttp://en.wikipedia.org/wiki/Threathttp://en.wikipedia.org/wiki/Qualitative_datahttp://en.wikipedia.org/wiki/Quantitative_property -
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is determining the relationship between doseand the probability or the incidence of effect(dose-response assessment). The complexityof this step in many contexts derives mainly
from the need to extrapolate results fromexperimental animals (e.g. mouse, rat) tohumans, and/or from high to lower doses
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http://en.wikipedia.org/wiki/Mousehttp://en.wikipedia.org/wiki/Rathttp://en.wikipedia.org/wiki/Rathttp://en.wikipedia.org/wiki/Mouse -
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aims to determine the amount of a contaminant
(dose) that individuals and populations will receive. As different location, lifestyles and other factors
likely influence the amount of contaminant that isreceived, a range or distribution of possible values
is generated in this step. Particular care is taken todetermine the exposure of the susceptiblepopulation(s).
4. Risk characterization : is the integration of the
foregoing three steps, which result in anestimation of the magnitude of the public healthproblem .
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=CDI
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