<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2020000200232</article-id>
<article-id pub-id-type="doi">10.31349/revmexfis.66.232</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Experimental and fractional analysis of half-value thicknesses of polyethylene absorber]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Çalik]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[&#350;irin]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[&#350;en]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Ege University Faculty of Science Department of Physics]]></institution>
<addr-line><![CDATA[&#304;zmir ]]></addr-line>
<country>Turkey</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Ege University Graduate School of Natural and Applied Science Department of Physics]]></institution>
<addr-line><![CDATA[&#304;zmir ]]></addr-line>
<country>Turkey</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<volume>66</volume>
<numero>2</numero>
<fpage>232</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2020000200232&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2020000200232&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2020000200232&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this study, half-value thicknesses and mass attenuation coefficients of polyethylene absorber have been measured experimentally using the beta sources 99 Tc, 147Pm, 137 Cs, 2º4Tl, 210Pb, and 36 Cl. There is an inconsistency between experimental and calculated values of half value thicknesses obtained with the help of a standard attenuation equation. In order to overcome this discrepancy, the fractional attenuation equation which was redefined and resolved using Caputo fractional derivative has been used. Toe theoretical results obtained according to this new equation are in agreement with experimental results around 0.3 value of the order of fractional derivative.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Half-value thickness]]></kwd>
<kwd lng="en"><![CDATA[fractional calculus]]></kwd>
<kwd lng="en"><![CDATA[polyethylene absorber]]></kwd>
<kwd lng="en"><![CDATA[29.25.-t]]></kwd>
<kwd lng="en"><![CDATA[02.30.Hq]]></kwd>
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