The ratio of the activity of the SLRDs to the activity of the radon gas is called the Equilibration Ratio (ER). Equilibrium usually occurs in about three to four hours. When an individual receives a dose of one WL in 170 hours (a miner's month), the exposure then becomes called a working level month or WLM.
I imagine it was probably my first Prehospital Trauma Life Support class back in 1990 that I first heard of the three collision rule. Since then, it has remained a useful tool in examining the mechanism of injury after auto accidents. If you havenât heard of it, please allow me to elaborate. The three collision rule states that, in any auto accident, there are three collisions that occur and the keen EMT needs to be aware of all three.
Chances are these crashes won't be deadly. There are about 10 million accidents of all kinds each year, from parking lot scrapes to multi-car pileups, according to the National Safety Council; in 2009, just three of every 1,000 of those accidents involved fatalities. But these crashes most likely will be costly. More than 2 million people are injured in crashes every year. In 2010, the average claim for injuries to cover both the insured driver and others involved in the crash had risen to $23,450, thanks in large part to soaring medical costs, according to the Insurance Research Council, a nonprofit research group. More On This...