lape
LAPE e-log
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Entry time:
Tue Sep 1 14:24:39 2026
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p> Tabelas de atenuacao com uma faixa de energia mais amplas sao dadas em</p> <p><a href="http://physics.nist.gov/PhysRefData/XrayMassCoef/tab3.html">http://physics.nist.gov/PhysRefData/XrayMassCoef/tab3.html</a></p> <p>Por exemplo, para o silício, com densidade rho = 2,33 g/cm^3 e potencial de ionizacao médio I=173eV, <font face="Times" size="3"><br /> </font></p> <p>o mass attenuation coefficient é u/rho= 3.207e-1 (I/I_0 = exp [-(u/rho)*x], x=rho*t, t=espessura.</p> <p>Logo , para 300 um de silício, temos I/I_0= exp[-3.207e-1 *2,33*300e-4]=0.978 </p> <p> <table cellpadding="1" cellspacing="0" border="0" style="font-family: Times; "> <tbody> <tr valign="top" align="right"> <td width="84">6.00000E-02</td> <td width="107">3.207E-01</td> <td width="64">1.434E-01</td> </tr> </tbody> </table> </p> <p>Achei também essa figura em <a href="http://www.carroll-ramsey.com/tutor1.htm">http://www.carroll-ramsey.com/tutor1.htm</a>, que mostra uma eficiencia de 3%.</p> <p> </p> <p> </p></td> </tr> </tbody> </table> </p><p> </p>
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