EESA01H3 Lecture Notes - Lecture 10: Risk Assessment, Exposure Assessment, Reference Dose
17 Feb 2017
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Document Summary
Risk possibility? or probability of suffering harm from a hazard. Why risk assessment? (shown in #s) helps cover gaps takes shorter time to figure things out. Must sometimes take action without full scientific understanding of hazard. Risk assessment sets default procedures for bridging gaps in scientific understanding. Basic framework: evaluate exposure and toxicity; bring this information together to (cid:272)hara(cid:272)terize a health risk . Benefits of risk assessment (extracted from natural research council 1994) Help identify risks that are easily reduced or eliminated. Help clarified what is known and not known about situation. Can provide quantitative information for decision making. Health canada regulations for foods and drugs. Canada council of ministers of the environment: national contaminated sites program, canada-wide environmental standards (cwes) Ontario ministry of environment: site-specific clean-up guidelines for contaminated soils. Need to check and make it licensed before use. Stages of risk assessment: problem definition, identify contaminant, receptor analysis, pathways analyses, exposure assessment, toxicity assessment, risk characterisation, uncertainties, critique.
