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TABLE 2 <br /> SUMMARY OF RADIOISOTOPE SOURCE CHARACTERISTICS <br /> F FSource Activity Half-Life Excitation Energy Elemental Analysis Range <br /> mCi (Years) keV <br /> Fe-55 20-50 2.7 5.9 Sulfur to Chromium K Lines <br /> Molybdenum to Barium L Lines <br /> Cd-109 5-30 1.3 22.1 and 87.9 Calcium to Rhodium K Lines <br /> Tantalum to Lead K Lines <br /> Barium to Uranium L Lines <br /> Am-241 5-30 458 26.4 and 59.6 Copper to Thulium K Lines <br /> Tun sten to Uranium L Lines <br /> Cm-244 60-100 17.8 14.2 Titanium to Selenium K Lines <br /> Lanthanum to Lead L Lines <br /> Source: Reference 1, 2, and 3 <br /> TABLE 3 <br /> SUMMARY OF X-RAY TUBE SOURCE CHARACTERISTICS <br /> Anode Recommended K-alpha Elemental Analysis Range <br /> Material Voltage Range Emission <br /> kV keV <br /> Cu 18-22 8.04 Potassium to Cobalt K Lines <br /> Silver to Gadolinium L Lines <br /> Mo 40-50 17.4 Cobalt to Yttrium K Lines <br /> Europium to Radon L Lines <br /> Ag 50-65 22.1 Zinc to Technicium K Lines <br /> Ytterbium to Neptunium L Lines <br /> Source: Reference 4 <br /> Notes: The sample elements excited are chosen by taking as the lower limit the same ratio of <br /> excitation line energy to element absorption edge as in Table 2 (approximately 0.45) and the <br /> requirement that the excitation line energy be above the element absorption edge as the upper <br /> limit (L2 edges used for L lines). K-beta excitation lines were ignored. <br /> CD-ROM 6200 - 24 Revision 0 <br /> January 1998 <br />