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Studying Different Etching Methods Using CR-39 Nuclear Track Detector

Detection 2016年第3期4卷 45-53页

作者： nada farhan kadhum Layth Abdulhakeem Jebur Ali A. Ridha Department of Physics College of Science Al-Mustansiriyah University Baghdad Iraq

In this research we try to investigate the optimum etching time for the tracks originate in (CR-39) solid state nuclear track detector after irradiated with alpha source (241Am) using three different etching techniques: the traditional method (water bath), microwaves and ultrasound devices. The track etching parameters: bulk etch rate (VB), track etch rate (VT), track etch rate ratio evaluates (V), critical angle (θC), and etching efficiency (η) were calculated in this research. It’s seen that the optimum etching time was ranging with (60 - 150 min), (20 - 30 min) and (60 - 120 min) when etching with water bath, microwave and ultrasound respectively. Also we observed that the critical angle was (24.29) when etching CR-39 detector with microwave. This value is lower than the critical angles values for the detector etched with water bath or ultrasound;thus it can be the optimum magnitude because its decrease leads to increasing the number of the tracks appeared in the detector and the etching efficiency.

关键词： Chemical Etching Microwave Ultrasound CR-39 Track Etching Parameters

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The impact on alpha emission rates of varying distances between a CR-39 detector and alpha-emitting bone samples

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Radiation Detection Technology and Methods 2021年第4期5卷 618-626页

作者： nada farhan Kadhim Yasser Ayad Kadhim Rasha S.Ahmed Ali A.Ridha Mostafa Y.A.Mostafa Department of Physics College of ScienceMustansiriyah UniversityBaghdadIraq Department of Physiology College of MedicineAl-Nahrain UniversityP.O.Box 70010AlkadhimiyaBaghdadIraq Physics Unit Science DepartmentRustaq College of EducationUniversity of Technology and Applied SciencesMuscatSultanate of Oman Physics Department Faculty of ScienceMinia UniversityEl-Minia 61519Egypt Ural Federal University Mira Street 19YekaterinburgRussia620002

Background Changing the distance between a sample and an exposed solid-state nuclear track detector affects the number of alpha tracks recorded by the *** concept had been used to distinguish high-energy alpha particles by computing the alpha emission rate at two distances(0 and 2 cm)from animal bone *** and methods Two Cr-39 detectors were placed in a container with bone ash inside to measure the alpha emission rate when the detectors were in contact with the ash and hung at a distance of 2 cm from the *** The alpha emission rate was found to be 62.7×10^(−4) Bq cm^(−2) when the detector was in contact with the sample(a small exposure area)and 324.4×10^(−4) Bq cm^(−2) when the sample was placed 2 cm away(a larger exposure area).A mathematical equalization of the exposure areas was conducted(the area of the detector exposed to the alpha emitter sample at a distance of 2 cm was equalized to the area exposed when in contact with the sample).After equalization,a reduction in the average value of the alpha emission rate from 324.4×10^(−4) to 17.4×10^(−4) Bq cm^(−2) was *** The increase in distance between the sample and the detector allowed only high-energy alpha particles with a range greater than the traveled distance to reach the ***,this system can distinguish the type and number of nuclides in the sample by changing the distance between the detector and the sample according to each nucleus ***,the results show that the alpha emission rates in these bone samples are higher than the local values.

关键词： Radioactivity Animal bone CR-39 detector Track density Alpha range

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