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Half Life And Mean Life . Half life of radioactive substance is average time it takes for sample n 0 to reduce to n 0 /2. In 14 more days, half of that remaining half will decay, and so on. Half Life and Mean Life from www.slideshare.net The mean life also turns out to exactly equal the number τ that appears in the exponential term e −t/τ involved with describing decay or growth, called the time constant. Λ is the decay constant. The si unit for measurement of activity is ‘ becquerel’ and is defined as, 1 becquerel = 1 bq = 1 decay per second.

What Does Tooth Decay Mean . When plaque isn’t brushed away at least twice per day, it produces a foul odor and leads to another smelly process, tooth decay. Decay results from the action of bacteria that live in plaque, which is a sticky, whitish film formed by a protein in saliva (mucin) and. Celiac Disease and Your Oral Health Westermeier Martin from wmsmile.com If plaque is allowed to build up, it can lead to further problems, such as dental caries (holes in the teeth), gum disease or dental abscesses , which are collections of pus at the end of the teeth or in the gums. So, if you have bad breath, your tooth decay might not necessarily have caused it directly. Cavity, caries, dental caries, tooth decay noun.