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Effects of Changing the Exposure Time of CR-39 Detector to Alpha Particles on Etching Conditions |
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PP: 119-125 |
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doi:10.18576/jrna/050206
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Author(s) |
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Manar Dheyaa Salim,
Ali A. Ridha,
Nada Farhan Kadhim,
Atef El- Taher,
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Abstract |
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| In our paper, we attempt to verify the best etching conditions of CR-39 track detector given by two duration exposure times at (5 and 15sec) by 226Ra alpha source using three techniques for heating etchant chemical solvent, which are the traditional heating technique using a water bath, ultrasound and microwave. Several cases for CR-39 detector for the development of tracks and its growth with using the three heating techniques of chemical etching solvent (NaOH) are described and compared. Its found that, the maximum track densities for water bath were found to be (5659 and 12976 tracks/mm2) which were appeared at (120 and 90min) for the detector exposed at (5 and 15sec) respectively, while the maximum track densities for ultrasound were found to be (5577 and 11660 tracks/mm2) which were appeared at (120 and 90min) for the detector exposed at (5 and 15sec) respectively. The microwave is the optimum etching technique, because of the highest track densities and the very short time required (10min) to developed the tracks, which are (7051 and 13333 tracks/mm2) at the detector exposed for (5 and 15sec) respectively. Also, the chemical etching parameters for the three techniques are determined, a significant increase were observed in bulk etching rate (VB), track etching rate (VT) when using microwave relative to the parameters when using water bath and ultrasound. And because the increased of the etch rate of track to the bulk etch rate in the microwave technique is less than that in the other two techniques, the efficiency of the detector (ɳ) using the microwave technique is less than the both (water bath and ultrasound) techniques.
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