Research Journal of Applied Sciences 14 (1): 45-48, 2019 ISSN: 1815-932X © Medwell Journals, 2019 Corresponding Author: Hussain A. Al-Jobouri, Department of Physics, College of Science, Al-Nahrain University, Baghdad, Iraq 45 Determination the Effect of Gamma Radiation on (CR-39, CN-85) Detectors by Using of Penetration of (He-Ne) Laser Beam Hussain A. Al-Jobouri, Fala H. Taha, Laith Ahmed Najam and Wijdan Thamer Faaz 1 2 3 1 Department of Physics, College of Science, Al-Nahrain University, Baghdad, Iraq 1 Madanet Alelem University College, Baghdad, Iraq 2 Department of Physics, College of Science, Mosul University, Mosul, Iraq 3 Abstract: The penetration of (He-Ne) laser beam on the Nuclear Track Detectors (NTDs) types CR-39 and CN-85 was measured after the gamma radiation effects with doses (0, 42.3, 84.6, 126.9, 169.2, 211.5, 253.8 Gy) and (0, 12.7, 25.4, 38.1, 50.8, 63.4, 76.1, 88.8 Gy) or CR-39 and CN-85 detectors, respectively. The penetration of (He-Ne) laser beam was also measured after the stress effect at the range (50, 55, 65, 100, 102, 106 N) for both detectors. The penetration coefficient of (He-Ne) laser beam ln(P /P ) was calculated when P is the penetration 0 av 0 of laser beam through detectors without gamma radiation and stress effects and P is average the penetration av of laser beam through detectors with the gamma radiation and stress effects. The value of ln(P /P ) was increase 0 av with increase of gamma radiation dos until to 220 and 75 Gy for CR-39 and CN-85 detectors, respectively. While the value of ln(P /P ) was increase with increase of stress effect until to 1.6×10 N/m and 12×10 N/m for CR-39 0 av 6 2 6 2 and CN-85 detectors, respectively. This study shows there is a possibility to use the penetration of (He-Ne) laser beam to measure the effect of gamma radiation and stress on anther (NTDs). Key words: Nuclear track detectors, CR-39, CN-85, gamma radiation, (He-Ne) laser beam, stress, strain effect INTRODUCTION determining the effect of IR irradiation on some polymers Nuclear Track Detectors (NTDs) used to analyzing the X-Ray Diffraction (XRD) and UV-visible measurements the effect of particulate radiation, including spectra (Rafique et al., 2010). alpha particles (Mohammad and Azawe, 2013) and The mechanical specification as stress and strain of thermal neutrons (Kumar et al., 2009, 2010) protons CR-39 studies by Ali (2006) which showing the change in (Sinenian et al., 2011) in addition to the ionic particles the value of stress produce the inversing in strain value. (Kumar et al., 1982). Mandal and Nagahanumaiah (2014) found that the It has been used to measure the radiation pollution of relationship between the height/depth of the CR-39 alpha rays in the environmental fields through routine detector was increased by increasing the stress. radiological survey or in cases of radiation accidents Laser beam was used with NTDs in many studies accompanied by alpha emitters (Al-Saad and Abbas, (Zaki et al., 2013) by measuring the radiation effect of the 2001). laser beam. Where the effect of gamma radiation on NTDs NTDs used also, to measurement of non-particulate was measuring by UV-visible, FTIR spectroscopy, thermal radiation, including gamma radiation (Malek and Chong, diffusion analyzing (Al-Jobouri et al., 2018; Neamah, 2017) 2002) UV radiation (Wong and Hoberg, 1982; Chun, 2007) calculated the radiation effect of gamma rays by laser (Zaki et al., 2013) and microwave radiation measuring the permeability of the laser beam. In this study (Al-Jobouri et al., 2012). It was proved through these the effect of gamma radiation and stress on CR-39 and studies that the radiation effect of non-particulate CN-85 detectors was measuring by using the penetration radiation changed in the physical specifications of the of (He-Ne) laser beam . NTDs. These change include optical absorbance through UV-visible spectroscopy (Al-Jobouri et al., 2015), relative MATERIALS AND METHODS transmittance of infrared radiation through -FTIR spectroscopy (Raouf, 2013). Moreover, NTDs types Two types of nuclear track detectors NTDs were CR-39 and Lexan detectors were calibrated as low-LET used in this study. The first one was CR-39 detector with radiation dosimeters (Sinha et al., 1998; Tavera et al., thickness 1200 μm (10×5 cm) and density 1.32 g/cm , 2005). The effect of non-ionizing radiation (IR, UV and supplied by TASTRAK type (Track Analysis System laser) on NTDs was studied by Prasher et al. (2009) for Ltd.), UK and having a chemical formula C H O. and studies the modifications owing to irradiation by 3 12 18 7