8 International Journal of Recent Research and Review, Vol. IX, Issue 1, March 2016 ISSN 2277 – 8322 Image Analysis of Cr-39 and Cn-85 Detector Irradiated by Thermal Neutron Hussain A. Al-Jobouri 1 , Laith Ahmed Najam 2 , Mustafa Y. Rajab 1 1 Department of Physics, College of Science, AL-Nahrain University, Baghdad, Iraq 2 Department of Physics, College of Science, Mosul University, Mosul, Iraq E-mail: hahmed54@gmail.com Abstract- Image processing technique used Image-J program to analysis tracks of α - particles in the nuclear track detectors type CR-39 and CN-85 after irradiated detectors by thermal neutrons from ( 241 Am- 9 Be) source with activity 12Ci and neutron flux 10 5 n.cm -2 .s -1 . Alpha particle incident on detector produce from 10 B(n,α) 7 Li interaction after covered the detectors within boric acid H 3 Bo 3 pellets. The irradiation times T D from thermal neutron source for both detectors were 4h, 8h, 16h and 24h. The analyze of outputs Image-J program for irradiated detectors found the irradiation time T D has behavior linear relationships with maximum track number M RA (with depended on track area A T ) at range of radiation response region 12 µm 2 - 22 µm 2 for CR-39 detector and 5 µm 2 - 27µm 2 for CN-85 detector. Also the behaviorofirradiation time T D with maximum track number M A (without depending on track area A T ) was linear relationship. The behaviors of maximum track number M RA and maximum track number M A with irradiation time T D which calculated by the Image-J program may be reflect to thermal neutron effect on CR-39 and CN-85 detectors. Keywords- Image processing, Solid-state detectors, Neutron radiation effects, Image analysis. I. INTRODUCTION Solid-state nuclear track detectors-SSNTDs have found a large field of applications in various domains of science such as nuclear physics, geochemistry or geochronology [1]. There were many techniques used with tracks in SSNTDs include application of Fourier optics and also applying image processing techniques to improve track images [2]. In fact, these methods are able to improve applications of SSNTDs, particularly when they are accompanied by image processing techniques [3]. In 1976 W. Abmayr et al. used an on-line TV-system for real time analysis of two-dimensional images is described which is being used for automatic evaluation of track detectors [4]. Then James H. and Adams Jr.measured of tracks made by Alpha particles and fission fragments in CR-39nuclear track detectors automatically by image analysis software using an accurate programming processor [5], R. Flores et. al. used device efficient in track counting for SSNTD which consists of an optical Fourier processor [6].When an automatic counting method with an image scanner used by H. Ohiwa and N. Wada [7], through using a code for the numerical analysis of images from a CCD camera has been written and applied to the visualization of α- particle tracks in the solid state nuclear track detectors [8] . Computer program named TRIAC I and TRIAC II written in MATLAB has been developed for track recognition and track parameters measurements from images of the solid state nuclear track detectors CR39 by D.L. Patiris et al. [9-10]. Used Image J program was used in many of the studies which tested in semi-automated mode for a computer-assisted alpha track counting of electro- chemically etched [11], while used software with fluorescent nuclear track detectors - FNTDs and plastic nuclear track detectors(PNTDs) to evaluate the contested accuracy of CR-39 [12,13] there for used Image J software to analysis fluorescent nuclear track detectors - FNTDs irradiated heavy charged particles [14], also used