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Po) in 1 liter of air that releases 1.3 × 10 5 MeV of potential alpha energy; [5] one WL is equivalent to 2.08 × 10 −5 joules per cubic meter of air (J/m 3). [1] The SI unit of cumulative exposure is expressed in joule-hours per cubic meter (J·h/m 3). One WLM is equivalent to 3.6 × 10 −3 J·h/m 3. An exposure to 1 WL for 1 working month ...
Contamination levels have been enumerated as I, II, III, and IV: [citation needed] Level I: Small, isolated areas (10 square feet (0.93 m 2) or less); remediation may be conducted by trained building staff; Level II: Mid-sized, isolated areas (10–30 square feet (0.93–2.79 m 2)); may also be remediated by trained, protected building staff;
Closely related terms are the rejectable quality limit and rejectable quality level (RQL). [ 1 ] [ 2 ] In a quality control procedure, a process is said to be at an acceptable quality level if the appropriate statistic used to construct a control chart does not fall outside the bounds of the acceptable quality limits.
There are three basic categories of water damage, based on the level of contamination. Category 1 Water - Refers to a source of water that does not pose substantial threat to humans and classified as "clean water". Examples are broken water supply lines, tub or sink overflows or appliance malfunctions that involves water supply lines.
Radon is thus assumed to be the second leading cause of lung cancer after smoking, and accounts for 15,000 to 22,000 cancer deaths per year in the US alone. [9] [better source needed] However, the discussion about the opposite experimental results is still going on. [10] About 100,000 Bq/m 3 of radon was found in Stanley Watras's basement in 1984.
Water quality depends on the local geology and ecosystem, as well as human uses such as sewage dispersion, industrial pollution, use of water bodies as a heat sink, and overuse (which may lower the level of the water). [citation needed]
Record levels were found in a house where the effective radiation dose due to external radiation was 135 mSv/a, (13.5 rem/yr) and the committed dose from radon was 640 mSv/a (64.0 rem/yr). [30] This unique case is over 200 times higher than the world average background radiation.
Environmental impact of fracking in the United States has been an issue of public concern, and includes the contamination of ground and surface water, methane emissions, [1] air pollution, migration of gases and fracking chemicals and radionuclides to the surface, the potential mishandling of solid waste, drill cuttings, increased seismicity and associated effects on human and ecosystem health.