[en] Two different types of SSNTDS CN-85B and L R-115 Type II B were used to record alpha tracks which were generated from eighteen curies of ²³⁸ Pu-⁹ Be neutron source that immersed in water phantom tank with a cylindrical shape. The source is located at Physics department, Faculty of Science, Prince of Songkla University. The films were placed radially in water phantom starting from the origin up to the distance 50 cm. with 5 cm. interval. After one week, the films were collected and etched with 2.5 N NaOH at 60 degrees C about 25 and 90 minutes etc. in order to enlarge the latent alpha registration tracks. The track density per unit area of each film was determined by optical microscope at 400 x magnifications. We found that L R-115 Type II B film is more sensitive to record alpha track than CN-85B film and we have used L R-115 Type II B film for further studies. The results showed that the profile of alpha track densities in the radial direction are in good agreement with neutron dose rate calculations using program ANISN under point source condition. This implies that a low cost films L R-115 Type II B can be used as a neutron dosimeter

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