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.
Although most rear-end collisions involve impacts that occur at less than 10 mph, they can still cause long-term injuries to the spine, neck, face, brain, and knees. Itâs no wonder why rear-end collisions are also referred to as âwhiplash accidents.â. When it comes to car accidents, the state of Tennessee is strict.