what X-rays of my teeth at the dentist show and why it has to be radioactive and what the heavy apron does
In: Physics
X-rays have a useful ability to pass through skin and muscle while not being able to pass through bones. By putting your mouth between an x-ray emitter and a special type of film (or sensor), the dentist can see your teeth below your gums.
X-rays fall into the category of “ionizing radiation”. This means they have the potential to rip molecules apart and cause mutations. X-rays at the dentist are so weak that there is very little risk, probably less than spending a sunny day outside without sunscreen. But one area that is especially prone to radiation damage is the reproductive system. The aprons have lead inside them, which absorbs radiation.
X-rays need to be ionizing in order to both be the right frequency to pass through skin and muscle but not bone, while also leaving a recognizable image on the film/sensor.
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