Abstract:In the present work,studies the effect uv-radiation dose(5 J/cm2 to 360 J/cm2)with power 15 W to LR-115 track detector thickness 100μm.Absorbance-A was measured at wavelength 600 nm and 650 nm by usinguv-vis...Abstract:In the present work,studies the effect uv-radiation dose(5 J/cm2 to 360 J/cm2)with power 15 W to LR-115 track detector thickness 100μm.Absorbance-A was measured at wavelength 600 nm and 650 nm by usinguv-visible spectroscopy and measure the transmission percent--T%and deviation at the wavenumber-w2907 cm1 by using Fourier infrared--FTIR spectroscopy.The relationship between the dose of radiation to the uv-radiation(J/cm2)and the absorbance-A at wavelength 600 nm and 650 nm and the wavenumber-w 2907 cm-1 was calculate as a polynomial relation.The present study show that there is a possibility to use the detector LR-115 to assessment doses of exposure to uv-radiation in the medical and environmental fields.展开更多
For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments i...For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments in normal radon laboratory were performed.The track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 h.The experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to αparticles.Therefore,the calibration factor K should be corrected from the calculated result.展开更多
The concentrations of 20 trace elements in several ceramics tiles and ceramic composites used in Egypt were elementally analyzed by neutron activation analysis(NAA) technique. The samples and standard were irradiate...The concentrations of 20 trace elements in several ceramics tiles and ceramic composites used in Egypt were elementally analyzed by neutron activation analysis(NAA) technique. The samples and standard were irradiated with reactor for 4 h(in the Second Research Egyptian Reactor(Et-RR-2)) with thermal neutron flux 5.9×10 13 n/(cm 2·s).The gamma-ray spectra obtained were measured for several times by means of the hyper pure germanium detection system(HPGe). Also a solid state nuclear track detector(SSNTD) CR-39, was used to measure the emanation rate of radon for these samples. The radium concentrations were found to vary from 0.39—3.59 ppm and the emanation rates were found to vary from (0.728—5.688) × 10 -4 kg/(m 2· s).The elemental analysis of the ceramic tiles and ceramic composites have a great importance in assigning the physical properties and in turn the quality of the material.展开更多
In this work, study of laser-induced ions is presented. The plasma was produced by focusing a Nd：YAG laser, with a wavelength of 1064 nm, a pulsed width of 9-14 ns, a power of 1.1 MW and energy of 10 mJ, on silver ta...In this work, study of laser-induced ions is presented. The plasma was produced by focusing a Nd：YAG laser, with a wavelength of 1064 nm, a pulsed width of 9-14 ns, a power of 1.1 MW and energy of 10 mJ, on silver target in vacuum （10-3 Torr= 1.3332 Pa）. The characteristics of ion streams were investigated by CR-39 detectors located at angles of 0°, 30°, 60° and 90° with respect to normal of the target. The distance between the silver target and each detector was 11 cm. The energy of silver ions was found ranging from 1.5 eV to 1.06E4 eV. There was a high concentration of ions with low energy as compared to those with high energy, showing the energy distribution amongst the ions. The flux of ions was maximum in the axial direction which was decreasing with the angle increase with respect to normal of the target, and finally became minimum in the radial direction. Hence the silver ions have shown anisotropic behaviour.展开更多
Thoron （Rn-220） is an invisible, odorless radioactive gas and nine times heavier than air. Purpose of project is to set up procedure to determine Rn-220 concentration which has been carried out in laboratory using S...Thoron （Rn-220） is an invisible, odorless radioactive gas and nine times heavier than air. Purpose of project is to set up procedure to determine Rn-220 concentration which has been carried out in laboratory using Solid State Nuclear Track Detector （SSNTD） based passive detector technique. In this study, technical procedure has been applied in Karlsruhe diffusion chamber and LR-115, Type II strippable （Kodak Pathe, France） detector. The results have investigated how LR-115 work for Rn-220 by using Monazite ore to simultaneously measure Rn-222 and Rn-220. To carry out experiment, Karlsruhe diffusion chamber is used to with and without Poly-Ethylene （PE） membrane. Karlsruhe diffusion chamber with PE membrane only detect Rn-222, without PE membrane detect total Rn-222 and Rn-220. Precision evaluation by duplicate measure at 8 cm detector-source distance with relative standard deviation is less than 2.54%. Testing technical procedure, detectors have been sent to National Institute of Radiological Science （NIRS） for Rn-220 calibration exposure. After detectors have been calibration exposure at NIRS, it carried out all the following steps of procedure which set up at laboratory in 1NST, Vietnam. Finally, calibration factor calculated is 0.21 （tracks-cm2/Bq·m3·h） and constructed curve between integrated Tn-220 concentration and tracks density with factor R2 = 0.975.展开更多
We use a nuclear technique based on the determination of the detection efficiencies of solid state nuclear track detectors CR-39 and LR-115 type II (SSNTDs) for alpha particles emitted from the series of uranium-238 a...We use a nuclear technique based on the determination of the detection efficiencies of solid state nuclear track detectors CR-39 and LR-115 type II (SSNTDs) for alpha particles emitted from the series of uranium-238 and thorium-232 in a phytotherapeutic sample and the measurement of alpha track densities registered on these detectors to assess alpha activities due to uranium-238;thorium-232;radon and thoron in samples of phytotherapeutic preparations consumed by Moroccan adult patients. For modern preparations, the alpha activities due to <sup>238</sup>U, <sup>232</sup>Th and <sup>222</sup>Rn range from 14.27 mBq/kg to 22.02 mBq/kg, from 6.27 mBq/kg to 9.64 mBq/kg and from 14.27 Bq/kg to 22.02 Bq/kg respectively. For classical preparations, the alpha activities due to <sup>238</sup>U, <sup>232</sup>Th and <sup>222</sup>Rn range from 16.73 mBq/kg to 24 mBq/kg, from 7.34 mBq/kg to 10.82 mBq/kg and from 16.73 Bq/kg to 24.72 Bq/kg respectively. A dosimetric model for ingestion has been highlighted to determine committed equivalent dose to different compartments of human gastrointestinal system due to the ingestion of phytotherapeutic preparations by Moroccan adult patients. The maximum overall effective dose due to <sup>238</sup>U, <sup>232</sup>Th, and <sup>222</sup>Rn after the ingestion of the studied phytotherapeutic preparations, was found equal to 38 × 10<sup>-8</sup> S·vy<sup>-1</sup> which is less than the dose limit given by the international commission for radiological protection in it publication 56.展开更多
Objective:To investigate the current levels of indoor radon activity in the geologically complex Bakony Region of Hungary,which has been historically affected by industrial activities,and to identify areas that may re...Objective:To investigate the current levels of indoor radon activity in the geologically complex Bakony Region of Hungary,which has been historically affected by industrial activities,and to identify areas that may require further monitoring and intervention.Methods:Experiments were carried out to measure quarterly indoor radon activity concentrations in ground-floor dwellings for a year using CR-39-type nuclear track detectors at 30 locations in 9 settlements to provide current information on the Bakony Region and identify areas requiring further attention.Results:Since the annual average indoor radon activity concentration in the Bakony Region was 86 Bq/m^(3) and the maximum 274 Bq/m^(3),that is,less than the 300 Bq/m^(3) national and EU reference levels,it is considered safe.Two locations were equal to or exceeded the reference level during part of the year.While most of the Region exhibited high radon concentrations in the autumn and winter,two settlements presented inverse seasonal variations.Conclusion:Although the autumn and winter values yielded a strong correlation with the annual mean and each other,this was not the case regarding the summer and spring values.The annual mean effective dose for the Region from the inhalation of radon and its progenies was estimated to be 2.2 mSv/year.展开更多
文摘Abstract:In the present work,studies the effect uv-radiation dose(5 J/cm2 to 360 J/cm2)with power 15 W to LR-115 track detector thickness 100μm.Absorbance-A was measured at wavelength 600 nm and 650 nm by usinguv-visible spectroscopy and measure the transmission percent--T%and deviation at the wavenumber-w2907 cm1 by using Fourier infrared--FTIR spectroscopy.The relationship between the dose of radiation to the uv-radiation(J/cm2)and the absorbance-A at wavelength 600 nm and 650 nm and the wavenumber-w 2907 cm-1 was calculate as a polynomial relation.The present study show that there is a possibility to use the detector LR-115 to assessment doses of exposure to uv-radiation in the medical and environmental fields.
文摘For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments in normal radon laboratory were performed.The track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 h.The experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to αparticles.Therefore,the calibration factor K should be corrected from the calculated result.
文摘The concentrations of 20 trace elements in several ceramics tiles and ceramic composites used in Egypt were elementally analyzed by neutron activation analysis(NAA) technique. The samples and standard were irradiated with reactor for 4 h(in the Second Research Egyptian Reactor(Et-RR-2)) with thermal neutron flux 5.9×10 13 n/(cm 2·s).The gamma-ray spectra obtained were measured for several times by means of the hyper pure germanium detection system(HPGe). Also a solid state nuclear track detector(SSNTD) CR-39, was used to measure the emanation rate of radon for these samples. The radium concentrations were found to vary from 0.39—3.59 ppm and the emanation rates were found to vary from (0.728—5.688) × 10 -4 kg/(m 2· s).The elemental analysis of the ceramic tiles and ceramic composites have a great importance in assigning the physical properties and in turn the quality of the material.
文摘In this work, study of laser-induced ions is presented. The plasma was produced by focusing a Nd：YAG laser, with a wavelength of 1064 nm, a pulsed width of 9-14 ns, a power of 1.1 MW and energy of 10 mJ, on silver target in vacuum （10-3 Torr= 1.3332 Pa）. The characteristics of ion streams were investigated by CR-39 detectors located at angles of 0°, 30°, 60° and 90° with respect to normal of the target. The distance between the silver target and each detector was 11 cm. The energy of silver ions was found ranging from 1.5 eV to 1.06E4 eV. There was a high concentration of ions with low energy as compared to those with high energy, showing the energy distribution amongst the ions. The flux of ions was maximum in the axial direction which was decreasing with the angle increase with respect to normal of the target, and finally became minimum in the radial direction. Hence the silver ions have shown anisotropic behaviour.
文摘Thoron （Rn-220） is an invisible, odorless radioactive gas and nine times heavier than air. Purpose of project is to set up procedure to determine Rn-220 concentration which has been carried out in laboratory using Solid State Nuclear Track Detector （SSNTD） based passive detector technique. In this study, technical procedure has been applied in Karlsruhe diffusion chamber and LR-115, Type II strippable （Kodak Pathe, France） detector. The results have investigated how LR-115 work for Rn-220 by using Monazite ore to simultaneously measure Rn-222 and Rn-220. To carry out experiment, Karlsruhe diffusion chamber is used to with and without Poly-Ethylene （PE） membrane. Karlsruhe diffusion chamber with PE membrane only detect Rn-222, without PE membrane detect total Rn-222 and Rn-220. Precision evaluation by duplicate measure at 8 cm detector-source distance with relative standard deviation is less than 2.54%. Testing technical procedure, detectors have been sent to National Institute of Radiological Science （NIRS） for Rn-220 calibration exposure. After detectors have been calibration exposure at NIRS, it carried out all the following steps of procedure which set up at laboratory in 1NST, Vietnam. Finally, calibration factor calculated is 0.21 （tracks-cm2/Bq·m3·h） and constructed curve between integrated Tn-220 concentration and tracks density with factor R2 = 0.975.
文摘We use a nuclear technique based on the determination of the detection efficiencies of solid state nuclear track detectors CR-39 and LR-115 type II (SSNTDs) for alpha particles emitted from the series of uranium-238 and thorium-232 in a phytotherapeutic sample and the measurement of alpha track densities registered on these detectors to assess alpha activities due to uranium-238;thorium-232;radon and thoron in samples of phytotherapeutic preparations consumed by Moroccan adult patients. For modern preparations, the alpha activities due to <sup>238</sup>U, <sup>232</sup>Th and <sup>222</sup>Rn range from 14.27 mBq/kg to 22.02 mBq/kg, from 6.27 mBq/kg to 9.64 mBq/kg and from 14.27 Bq/kg to 22.02 Bq/kg respectively. For classical preparations, the alpha activities due to <sup>238</sup>U, <sup>232</sup>Th and <sup>222</sup>Rn range from 16.73 mBq/kg to 24 mBq/kg, from 7.34 mBq/kg to 10.82 mBq/kg and from 16.73 Bq/kg to 24.72 Bq/kg respectively. A dosimetric model for ingestion has been highlighted to determine committed equivalent dose to different compartments of human gastrointestinal system due to the ingestion of phytotherapeutic preparations by Moroccan adult patients. The maximum overall effective dose due to <sup>238</sup>U, <sup>232</sup>Th, and <sup>222</sup>Rn after the ingestion of the studied phytotherapeutic preparations, was found equal to 38 × 10<sup>-8</sup> S·vy<sup>-1</sup> which is less than the dose limit given by the international commission for radiological protection in it publication 56.
基金implemented by the TKP2021-NVA-10 project with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research,Development and Innovation Fund,financed under the 2021 Thematic Excellence Programme funding scheme.
文摘Objective:To investigate the current levels of indoor radon activity in the geologically complex Bakony Region of Hungary,which has been historically affected by industrial activities,and to identify areas that may require further monitoring and intervention.Methods:Experiments were carried out to measure quarterly indoor radon activity concentrations in ground-floor dwellings for a year using CR-39-type nuclear track detectors at 30 locations in 9 settlements to provide current information on the Bakony Region and identify areas requiring further attention.Results:Since the annual average indoor radon activity concentration in the Bakony Region was 86 Bq/m^(3) and the maximum 274 Bq/m^(3),that is,less than the 300 Bq/m^(3) national and EU reference levels,it is considered safe.Two locations were equal to or exceeded the reference level during part of the year.While most of the Region exhibited high radon concentrations in the autumn and winter,two settlements presented inverse seasonal variations.Conclusion:Although the autumn and winter values yielded a strong correlation with the annual mean and each other,this was not the case regarding the summer and spring values.The annual mean effective dose for the Region from the inhalation of radon and its progenies was estimated to be 2.2 mSv/year.
