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.
Car crash statistics, especially for car crashes by age, are important indicators of the elevated risks of certain age groups when it comes to operating a motor vehicle. A car crash kills a person every 12 minutes on average in the United States. Every year there are more than 6 million car accidents, the cause of about 40,000 fatalities per year. Among other factors, statistics are compiled based on age and location. Depending on the age group, the chances of a fatal car accident is more or less likely to happen. Indeed, the highest risk age group is 16 to 19-year olds. The following is a list of statistics for car crashes based on age and location.