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Asbestos

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Submitted By yeabsitota
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What is Asbestos?

Asbestos is a naturally occurring group of minerals that can only be identified under a microscope. It is mined in much the same way that other minerals, such as iron, lead, and copper, are. Asbestos is composed of silicon, oxygen, hydrogen, and various other metal cations (positively charged ions). There are many varieties of asbestos. The three most common are chrysotile, amosite, and crocidolite. Chrysotile fibers are flexible and shaped like cylinders, and often arranged in bundle-like structures. Amosite and crocidolite fibers are like tiny needles.

Health Risks of Asbestos Exposure Chronic exposure to asbestos may increase the risk of lung cancer, mesothelioma, and nonmalignant lung and pleural disorders. Evidence in humans comes from epidemiologic studies as well as numerous studies of workers exposed to asbestos in a variety of occupational settings. Tremolite asbestos exposure has been associated with an increased incidence of disease in vermiculite miners and millers from Libby, Montana. This evidence is supported by reports of increased incidences of nonmalignant respiratory diseases, lung cancer, and mesothelioma in villages in various regions of the world that have traditionally used tremolite-asbestos whitewashes in homes or have high surface deposits of tremolite asbestos and by results from animal studies.
Risk Factors
Various factors determine how exposure to asbestos affects an individual:
•Exposure concentration - what was the concentration of asbestos fibers?
•Exposure duration - how long did the exposure time period last?
•Exposure frequency - how often during that time period was the person exposed?
•Size, shape and chemical makeup of asbestos fibers:
Individuals involved in the rescue, recovery, and cleanup at the site of the September 11, 2001, attacks on the World Trade Center (WTC) in New York City are another group at risk of developing an asbestos-related disease. Because asbestos was used in the construction of the North Tower of the WTC, when the building was attacked, hundreds of tons of asbestos were released into the atmosphere. Those at greatest risk include firefighters, police officers, paramedics, construction workers, and volunteers who worked in the rubble at Ground Zero. Others at risk include residents in close proximity to the WTC towers and those who attended schools nearby. These individuals will need to be followed to determine the long-term health consequences of their exposure.
A popular building material since the 1950s, asbestos was widely used in homes and commercial buildings until 1999, when it was finally banned. So if you’re working somewhere built or refurbished before 2000, then the chances are it could contain asbestos.
Here are the most common types and uses found in the home:

* Ceiling tiles * Pipe insulation

.

* Boilers * Sprayed and textured coatings * Asbestos cement sheeting * Board around windows, radiators and fireplaces * Soffit boards * Fire doors * Gaskets and sealants on pipes * Electrical boxes
Loose fill asbestos was used to insulate industrial and domestic premises so can be found between cavity walls, under floorboards and in loft spaces. This is a loose, fluffy insulation material (similar to candy floss), which may be blue-grey or whitish in color.
This is probably the most dangerous asbestos-containing material. Loose fill is made up of pure asbestos and if disturbed can release large amounts of fibers in to the air, where they can be breathed in. DO NOT attempt to work on this material under any circumstances unless you are an HSE-licensed contractor.
If you think you’ve found asbestos, before you start work make sure you know what to do to carry out the job safely. Taking just five minutes to assess the risks could save your life and protect your family and friends.

Resources * http://www.cancer.gov/ * http://www3.epa.gov/ * http://www.atsdr.cdc.gov/ * http://www.take5andstayalive.com/

Name: Yeabsitota Birru
Section: 10A
Career Development Cite: Pennsylvania Hospital
Day: Monday
Supervisor: Mrs. Rosetti
Research: Asbestos

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