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Solid nuclear track detector (CR-39) is one of nuclear track detectors reagents used in various branches of science and technology. In current study, the effect of temperature and time on properties of solid state nuclear track detectors (CR-39) has been studied after irradiation with Am-241 for 5 hours.The detector was examined with different temperatures (50 ,60,70 and 80 °C) and different times (5, 6, 7 and 8 h), to got the ideal condition for the detector. The parameters of diameter (D), density of tracks (ρ), bulk etch rate (VB), track etch rate (VT), sensitivity of the detector (V) and etching efficiency (η) have been calculted. The results have shown the maximum diameter and intensity are 2.88(µm) and the density of tracks 517 (track/mm2) respectively, at the temperature 70 ° C at time 6 h. Whilst the lowest diameter is 0.53(µm) at a temperature 50° C and time 5h, while, the lowest density of tracks is 82 track/ mm2 at temperature 80° C and time 8h. The highest VB and VT are found to be 0.241 (µm2/h) at 70° C with 6 h and 0.389 (µm2/h) at 80° C with 6 h respectively. Whilst, the maximum V and η are 2.666 and 0.625 at 70° C with 8 h, respectively. Depend on the results, the optimal conditions for etching of the solid nuclear track detector CR-39 is 70° C at 6 h. [ABSTRACT FROM AUTHOR]

Radon and thoron with short life-time play a large role in contributing to natural radiation. In this research the concentrations of radon and thoron in selected soil samples of Al-Shatrah city, Nasiriyah- Iraq were estimated. Solid State Nuclear Track Detectors (SSNTDS) technique has been used. Results showed that the highest average value of radon concentration is 464.28±63.60 Bq. m−3 and the lower concentration is 108.83±30.91 Bq. m−3 in Al-Thajil and Alhawi respectively. While, the highest concentration of thoron is 310.23±52.11Bq. m−3 and lower concentration is 2.12±0.35 Bq. m−3 in Al-Thajil and Hayi Alamin, respectively. On the other hand, the annual effective inhalation has varied between 2.93±0.40 mSv. y−1 to 0.69±0.19 mSv. y−1. The results of this study are less than 3 mSv. y−1, which is recommended by an International Commission on Radiological Protection (ICRP). [ABSTRACT FROM AUTHOR]