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4Â¥2009-06-24 08:09:40
Сľ³æ861
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2Â¥2009-06-23 17:30:52
lrj9987
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Сľ³æ861(½ð±Ò+1,VIP+0): 6-24 08:08
Сľ³æ861(½ð±Ò+1,VIP+0): 6-24 08:08
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3Â¥2009-06-24 08:05:38
harrychen8112
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Сľ³æ861(½ð±Ò+1,VIP+0):лл 6-24 15:35
Сľ³æ861(½ð±Ò+1,VIP+0):лл 6-24 15:35
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QUOTE=Radiological Considerations for the Operation of the Advanced Photon Source Storage Ring - Revised H. J. Moe September 24, 1997 Table 2 - Attenuation Lengths of Shielding Materials GRN MEN MATERIAL (density-g/cm3 ) BREMS ¦Ë (g/cm2 ) HEN Concrete (2.35) 49 40 65 115 Concrete (3.7) 50 45 70 125 Concrete Block (2.08) 49 40 65 115 Pb (11.35) 24 161 191 191 Polyethylene (0.93) 70 6.3 62 62 Fe (7.87) 34 100 138 138 W (densalloy 18.0) 26.3 161 184 184 |
5Â¥2009-06-24 09:13:46














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