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The work involves the utilizing of solid-state nuclear track detector CN-85, to study the irradiated impact through incident alpha particles at different angles (80°, 90°), and irradiation time (5) min, after etching with 2.5N of NaOH solution at 60°±1 C, for different etching time between (0.5-4) hr. The results showed that both D and L for CN-85 exhibited an enhancement when exposed to Alpha particles, the alpha-particle track diameters and Length increased with Etching time but it decreased with the increased Energy of alpha particles. The experiment results also show that the D and L were affected due to the exposure to alpha particles and incident angles. This study is the first-time investigation CN-85 Nuclear track detector experimentally under the impact of alpha particles and suitable polymer for the detection alpha particles. [ABSTRACT FROM AUTHOR]

Solid Nuclear Track Detectors (SNTDs), CR-39 type, are usually adopted to monitor radon gas concentrations. In order to characterize the detectors according to track geometrical parameters, detectors were irradiated inside a vacuum chamber by alpha particles at twelve energy values, obtained by different Mylar foils in front of a 241Am source. The alpha energy values were verified using a Si detector. After the exposure to the alpha particles, the detectors were chemically etched to enlarge the tracks, which were then analyzed by means of a semiautomatic system composed of an optical microscope equipped with a CCD camera connected to a personal computer to store images. A suitable routine analyzed the track parameters: major and minor axis length and mean grey level, allowing us to differentiate tracks according to the incident alpha energy and then to individuate the discrimination factors for radon alpha tracks. The combined use of geometrical and optical parameters allows one to overcome the ambiguity in the alpha energy determination due to the non-monotonicity of each parameter versus energy. After track parameter determination, a calibration procedure was performed by means of a radon chamber. The calibration was verified through an inter-comparing survey. [ABSTRACT FROM AUTHOR]