Impacts_on_Environment_and_Human_Health

Impacts_on_Environment_and_Human_Health - The risk of...

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Unformatted text preview: The risk of hazardous chemicals High risk – smoking or drinking while driving intoxicated Low risk – infrequent events that may have a large consequence, such as an earthquake on the east coast of U.S. Very low risk – events that have never occurred in recorded history Mixed risk – outcomes that increase in frequency against a background of occurrences Risk analysis is divided into risk assessment and risk management • Assessment is an objective estimation of risk using the identification of hazards, dose-response assessment, exposure assessment, and risk characterization • Management is the process of determining what to do about the risk including identification and use of mitigating measures Market-based – relies on market forces (typically responses from industry) Hierarchical method – relies on explicit controls from top-down management (typically lawmakers response) Sectarian method – relies on emotions (typically citizens response) Rational method – relies on logic and facts (typically researchers response) Acute health effects are characterized by sudden and severe exposure and rapid absorption of a substance (often reversible) Chronic health effects are prolonged or repeated exposures over long period of time with symptoms that may not be immediately apparent (often irreversible) Dose response relationships describe the change on an organism or a population caused by different levels of exposure to a substance A dose-response curve is a graph that relates the amount of drug or toxin given compared with the response Threshold Dose – the point on the graph where the response is first observed LD 50 – is the median lethal dose of a...
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This note was uploaded on 12/29/2010 for the course ENGR 514 taught by Professor Snitter during the Fall '10 term at Oregon Tech.

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Impacts_on_Environment_and_Human_Health - The risk of...

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