I am Khan Ihsan, Ph.D scholar at Harbin Engineering University. I am interested in radiation measurements ,like Naturally Occurring Radioactive Materials (NORM) using Gamma-Spectroscopy and Solid State Nuclear Track Detectors, and using (α- autoradiography technique). Radon measurements in different environmental samples using Solid State Nuclear track Detectors (Passive technique using CR-39 and LR-115 detectors). Radiation protection, shielding, dosimetry and calibration standard source.