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1、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RS21。

2、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RS21。

3、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RL32。

4、1 Useful documents include Roger Eckhardt, Ionizing Radiation Its Everywhere, LosAlamos Science, no. 23, 1995, a primer 。

5、Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RL31。