International Journal of Innovative Research in Advanced Engineering (IJIRAE) ISSN: 2349-2163 Issue 10, Volume 4 (October 2017) www.ijirae.com _________________________________________________________________________________________________ IJIRAE: Impact Factor Value – SJIF: Innospace, Morocco (2016): 3.916 | PIF: 2.469 | Jour Info: 4.085 | ISRAJIF (2016): 3.715 | Indexcopernicus: (ICV 2015): 47.91 IJIRAE © 2014- 17, All Rights Reserved Page -33 MEASUREMENT OF ENTRANCE SKIN EXPOSURE (ESE) VALUE WITH VARIOUS TYPES OF FILTER MATERIALS ON MOBILE X-RAY MACHINE USING EXPOSURE FACTOR OF CHEST Muchamad Azam *, Evi Setiawati**, Fenia *** *(Department of Physics, Diponegoro University, Semarang, ndonesia azamfisika@gmail.com , **(Department of Physics, Diponegoro University, Semarang, Indonesia evi_setiawati_msi@yahoo.com ***(Department of Physics, Diponegoro University, Semarang, Indonesia feni@st.fisika.undip.ac.id Manuscript History Number: IJIRAE/RS/Vol.04/Issue10/OCAE10084 DOI: 10.26562/IJIRAE.2017.OCAE10084 Received: 22, September 2017 Final Correction: 30, September 2017 Final Accepted: 05, October 2017 Published: October 2017 Citation: Azam, M., Setiawati, E. & Fenia (2017). MEASUREMENT OF ENTRANCE SKIN EXPOSURE (ESE) VALUE WITH VARIOUS TYPES OF FILTER MATERIALS ON MOBILE X-RAY MACHINE USING EXPOSURE FACTOR OF CHEST. IJIRAE:: International Journal of Innovative Research in Advanced Engineering, Volume IV, doi: 10.26562/IJIRAE.2017.OCAE10084 Editor: Dr.A.Arul L.S, Chief Editor, IJIRAE, AM Publications, India Copyright: ©2017 This is an open access article distributed under the terms of the Creative Commons Attribution License, Which Permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abstract— Measurement of Entrance Skin Exposure (ESE) value with a variety of types of material filter on mobile X-ray machine has been done using exposure factor of chest examination. The type of filter used is aluminum (Al), copper (Cu), galvalum (AlZnSi), and zinc (Zn). The tube voltage is varied at 70, 73, 77, and 81 kVp, fixed current-flow 20 mAs, SSD distance 100 cm, and radiation area 10 cm x 10 cm. The result of measuring the consistency of X-ray tube voltage has the biggest error of 1.52%. The exposure factor used in chest examination, which is 80 kVp obtained by interpolation of data. The result of measuring ESE value with exposure factor of chest (lateral) using filter 0.5 - 1.5 mmAlZnSi; 0.5 - 1.5 mmZn; and 0.5 - 1 mmCu are within tolerable limits. Similarly, the ESE value measurement results with filters 1 - 3.5 mmAl; 0.5 mmCu; 0.5 - 1 mmAlZnSi; and 0.5 - 1 mmZn is still within tolerable limits. The half ESE value of the 80 kVp exposure factor can be reached using a 3.2 mmAl filter. This value is equivalent to using a 0.17 mmCu filter; 0.23 mmAlZnSi; or 0.23 mmZn. Keywords— x-ray machine, ESE value, filter, HVL, multipurpose detector I. INTRODUCTION One radiology service is to use X-rays to support diagnostic and therapeutic processes. In X-ray imaging there is an ESE or Entrance Skin Exposure value, ie the measured exposure value at the center of the X-ray axis which is the center point of the region to be subjected to radiation. The ESE value is affected by the combination of targets (anodes) and filters used in the X-ray tube. Filter is a material designed to absorb X-rays selectively.