Lead is used to filter radiation exposure. The lead is precisely conformed, tool and died, into a precise mechanical fit working radiation filter. With lead filters, radiation exposure or the creation of radiation is controlled when using x-ray. What the lead filter controls is the amount of radiation that is employed while controlling the 'scatter'. Also the speed and accuracy of the x-ray (and any radiation) is controlled through the use of lead filters. I wasn't aware that lead actually absorbed radiation. Could be. We have some lead filters that have been in use 25 years now. It's not the filter that wears out or needs replaced, it ithe 'head' or 'tube' that creates the x-ray that weakens over time. Radiation can be 'controlled' and lead is one application to do so. Of course we are dealing with the ultimate 'scatter' or uncontrolled release of radiation effect. It will be interesting to see if lead comes in to play should the facility be 'buried'.
Note I install and I adjust the filters as needed for which particular x-ray of the cranium needed. I also adjust the x-ray head as to the amount of x-ray to produce depending on body size. So, I control the amount, speed, distance and accuracy of the x-ray as well as controll the radiation and particularily the 'scatter' radiation before taking any craniofacial x-ray. One thing I do that is not common in x-ray is to x-ray the cranium. Do you believe we work with oral surgeons asking for my head film because they do not have the equiptment.
As long as I do my job properly, there is no scatter radiation through the use of our 'control'. When that control is not deployed correctly, the scatter radiation is real.