According to the FDA Website:
“Mammography is a type of medical imaging that uses x-rays to capture images (mammograms) of the internal structures of the breasts. Quality mammography can help detect breast cancer in its earliest, most treatable stages – when it is too small to be felt or detected by any other method.” (http://www.fda.gov/cdrh/radhealth/products/mammography.html)
“Mammography uses x-rays to produce an image of the breast, and the patient is exposed to a small dose of radiation.”
“The benefits of mammography in detecting breast cancer at an early stage outweigh the risks of radiation exposure. In some cases, early detection of a breast lump may mean that chemotherapy is unnecessary.”
Please have a look around at the various maps. All of the maps posted here were created using the ArcGIS software from ESRI and the data was taken from the FDA Website (www.fda.gov) and the NJ DEP Website (www.state.nj.us/dep).