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Date: August 10, 2009 - page 14 / 16

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Table 3. Ra-226 concentrations in phosphogypsum derived from the major sources of phosphate rock in the United States***

Location

Ra-226 content (pCi/g)

Central Florida

20 - 35

North Florida

13 - 15

Idaho

23

***Roessler, C.E. (updated 19 May 2009) (http://hps.org/publicinformation/ate/q25.html)

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