<p class="AbstractEnglish"><strong>Abstract</strong>: In RSUD Dr. Moewardi available wedge angle of 15°, 30°, 45°, and 60°. This research simulates with Monte Carlo N-Particle eXtended Version (MCNPX) computer software to determine the geometry of the wedge that produces the isodose angle of 20°, which is hoped to be applied to therapy of organ tilt of 20 ° in some cases of cervical cancer. In simulation obtained the value of the wedge factor of isodose angle of 20° and distribution of dose rate. The simulated material of wedge is Lead-Antimony Alloy. Verification of the simulation result was done by measuring the wedge factor of angle of 30° and 60°, the simulation result was validated with result of measurement experiment on <sup>60</sup>Co teletherapy in RSUD Dr. Moewardi Surakarta. The relative error between simulation and measurement experiment of wedge angle of 30° is 8.84% and angle of 60° is 4.35%. The relative error is small to convince the researcher to develop a simulation at an isodose angle of about 20°. From the simulation results obtained isodose angle 20.3° of Lead-Antimony Alloy material with geometry is length 16 cm, width 14.9 cm, thick 0.83 cm, the value of the angle α of 3.2°. Wedge factor of isodose angle of 20.3 ° is (0.68 ± 0.01). Wedge isodose angle of 20.3° if used in therapy in an organ tilt about 20 ° gives dose rate enough uniform.</p><p class="KeywordsEngish"> </p><p class="AbstrakIndonesia"><strong>Abstrak </strong><strong>:</strong>. Di RSUD Dr. Moewardi tersedia <em>wedge </em>untuk sudut 15°, 30°, 45°, dan 60°. Penelitian ini mensimulasikan dengan software computer <em>Monte Carlo N-Particle eXtended Version</em> (MCNPX) untuk menentukan geometri <em>wedge </em>yang menghasilkan sudut isodosis 20°, dimana diharapkan dapat diaplikasikan pada terapi organ dengan kemiringan 20° di beberapa kasus kanker serviks. Besaran yang diperoleh dari simulasi adalah nilai faktor transmisi <em>wedge </em>sudut isodosis 20° dan distribusi laju dosis serap penggunaan <em>wedge </em>tersebut. Bahan <em>wedge</em> yang disimulasikan adalah <em>Lead-Antimony Alloy</em>. Verifikasi hasil simulasi dilakukan dengan pengukuran faktor <em>wedge</em> pada sudut isodosis 30° dan 60°, hasil simulasi divalidasi dengan hasil pengukuran langsung pada pesawat teleterapi <sup>60</sup>Co di RSUD Dr. Moewardi Surakarta. Kesalahan antara simulasi dan pengukuran langsung pada isodosis sudut 30° adalah 8,84 % dan pada sudut 60° adalah 4,35 %. Kesalahan relatif tersebut cukup kecil sehingga meyakinkan peneliti untuk menyusun simulasi pada sudut sekitar 20°. Dari hasil simulasi diperoleh isodosis sudut 20,3° dari bahan <em>Lead-Antimony Alloy</em><em> </em>dengan geometri yaitu panjangnya 16 cm, lebarnya 14,9 cm, tebalnya 0,83 cm, nilai sudut α sebesar 3,2°. Faktor <em>wedge</em> sudut 20,3° sebesar (0,68 ± 0,01). <em>Wedge</em><em> </em>sudut isodosis<em> </em>20,3° bila digunakan dalam terapi pada organ dengan kemiringan 20° memberikan laju dosis yang cukup seragam.<strong></strong></p><p class="KataKunci"> </p>
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