powerpoint presentation500 0 500 1500 (kilometers) nad27/*dnag 88 68 48 46 44 43 42 40 dose (ngy/hr)...
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https://www.epa.gov/radiation/radiation-sources-and-doses
https://pubs.usgs.gov/of/2005/1413/fullcosmic.htm
http://ncrponline.org/wp-content/themes/ncrp/PDFs/Fig1-1.pdf
2006