Determined the bulk etch rate VB by different methods for nuclear track detector CR-39

In this study, the bulk etch rate (VB) was measured by three different methods forCR-39 with a thickness of 200µm and an area (1 × 1 cm2), where CR_39 irradiated through from Am241source energy alpha particles is 2.6MeV at angle fall perpendicular to surface CR-39 detector, detector etching (NaOH) concentration 6.25N (70 ± 1°C) showing effects formed on time periods ranging (0.25h) were photographed eching times using optical microscope type (XSZ-H Series Biological Microscope) equipped digital camera (MADC_5A) connected personal computer, in order find length, diameters track detector.VB determind are: Removed method, second saturation diameter-length method (D_L method), as first does not require irradiation but other two measurement lengths And proving effect, we found that values VB for methods, removed effect ((D_L method) respectively are:, (1.206, 1.204, 1.271 (µm/h) compare results between mentioned they are close.