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.
The National Safety Council reports that cell phone use while driving leads to 1.6 million crashes each year. Nearly 330,000 injuries occur each year from accidents caused by texting while driving. 1 out of every 4 car accidents in the United States is caused by texting and driving. Texting while driving is 6x more likely to cause an accident than driving drunk. Answering a text takes away your attention for about five seconds.