Dosimetric analysis of graphitic carbon nitride quantum dots exposed to a gamma radiation for a low-dose applications
In this study, graphitic carbon nitride quantum dots (g-C3N4QDs) were synthesized using different solvents, characterized, and then exposed to a gamma-ray source (137Cs) at irradiation doses of 0.1, 1.48, 2.05 and 3.25 Gy. The intensities of the emission bands progressively were attenuated as the received dose of gamma radiation increased. The changes were quantified with the help of a non-linear fit model. The material showed promising use as a dosimeter for low-dose radiation applications.PMID:35325648 | DOI:10.1016/j.apradiso.2022.110200 (Source: Applied Radiation and Isotopes)
Source: Applied Radiation and Isotopes - March 24, 2022 Category: Radiology Authors: M Perez M A Vallejo C G ómez E Montes J Elias A Torres-Castro H R Vega-Carrillo M Sosa Source Type: research

Evaluation of gamma response ability of single-mode and multi-mode optical fibers with different dopants as dosimeter sensors
Appl Radiat Isot. 2022 Mar 18;184:110206. doi: 10.1016/j.apradiso.2022.110206. Online ahead of print.ABSTRACTOptical fiber is used as a tool for data transmission in radiation environments in many applications such as medical, plasma diagnostics, and space satellites. The optical transmission is affected by ionizing radiation, characterized by radiation-induced attenuation. This feature allows use as a dosimeter sensor. In this work, the gamma radiation responses of three types of single-mode and multi-mode fibers, with different dopants of erbium (Er), germanium (Ge), and phosphorus (P) were evaluated. Radiation-induced a...
Source: Applied Radiation and Isotopes - March 24, 2022 Category: Radiology Authors: S Asgari H Jafari R Taheri Ghahrizjani S A H Feghhi M Bataee Source Type: research

Dosimetric analysis of graphitic carbon nitride quantum dots exposed to a gamma radiation for a low-dose applications
In this study, graphitic carbon nitride quantum dots (g-C3N4QDs) were synthesized using different solvents, characterized, and then exposed to a gamma-ray source (137Cs) at irradiation doses of 0.1, 1.48, 2.05 and 3.25 Gy. The intensities of the emission bands progressively were attenuated as the received dose of gamma radiation increased. The changes were quantified with the help of a non-linear fit model. The material showed promising use as a dosimeter for low-dose radiation applications.PMID:35325648 | DOI:10.1016/j.apradiso.2022.110200 (Source: Applied Radiation and Isotopes)
Source: Applied Radiation and Isotopes - March 24, 2022 Category: Radiology Authors: M Perez M A Vallejo C G ómez E Montes J Elias A Torres-Castro H R Vega-Carrillo M Sosa Source Type: research

Evaluation of gamma response ability of single-mode and multi-mode optical fibers with different dopants as dosimeter sensors
Appl Radiat Isot. 2022 Mar 18;184:110206. doi: 10.1016/j.apradiso.2022.110206. Online ahead of print.ABSTRACTOptical fiber is used as a tool for data transmission in radiation environments in many applications such as medical, plasma diagnostics, and space satellites. The optical transmission is affected by ionizing radiation, characterized by radiation-induced attenuation. This feature allows use as a dosimeter sensor. In this work, the gamma radiation responses of three types of single-mode and multi-mode fibers, with different dopants of erbium (Er), germanium (Ge), and phosphorus (P) were evaluated. Radiation-induced a...
Source: Applied Radiation and Isotopes - March 24, 2022 Category: Radiology Authors: S Asgari H Jafari R Taheri Ghahrizjani S A H Feghhi M Bataee Source Type: research

Xenon-filled diode performance under influence of low doses of gamma radiation
Appl Radiat Isot. 2022 Mar 18;184:110207. doi: 10.1016/j.apradiso.2022.110207. Online ahead of print.ABSTRACTThis paper presents a detailed statistical analysis of experimental results of dynamic breakdown voltage and electrical breakdown time delay for xenon-filled diode. These quantities have a stochastic nature and they were measured in the cases when the xenon-filled diode was and was not exposed to a gamma radiation source, with exposure dose rate 7.7⋅10-12 C/(kg⋅s). The static breakdown voltage was estimated based on dynamic breakdown voltage as a function of voltage increase rate. The applicability of certain di...
Source: Applied Radiation and Isotopes - March 22, 2022 Category: Radiology Authors: Mili ć M Pejović Emilija N Živanović Milan D Stojanovi ć Source Type: research

Performance of various mathematical functions for the in-situ relative detector efficiency towards its applicability for k < sub > 0 < /sub > IM-NAA
Appl Radiat Isot. 2022 Mar 14;184:110194. doi: 10.1016/j.apradiso.2022.110194. Online ahead of print.ABSTRACTThe in-situ relative detection efficiency strongly influences the characteristics of the k0-based internal monostandard neutron activation analysis (IM-NAA). In the present work, various mathematical functions were explored for the establishment of in-situ relative detector efficiency calibration and compared their performance based on the reduced chi-square (χ2) values. Among the various mathematical functions, the polynomial logarithm with 6th order was found to be associated with the minimum mean standard deviat...
Source: Applied Radiation and Isotopes - March 22, 2022 Category: Radiology Authors: Manish Chand J S Brahmaji Rao S K Samanta Rajendra Singh Shekhawat R Senthilvadivu G V S Ashok Kumar Kumar R Source Type: research

Xenon-filled diode performance under influence of low doses of gamma radiation
Appl Radiat Isot. 2022 Mar 18;184:110207. doi: 10.1016/j.apradiso.2022.110207. Online ahead of print.ABSTRACTThis paper presents a detailed statistical analysis of experimental results of dynamic breakdown voltage and electrical breakdown time delay for xenon-filled diode. These quantities have a stochastic nature and they were measured in the cases when the xenon-filled diode was and was not exposed to a gamma radiation source, with exposure dose rate 7.7⋅10-12 C/(kg⋅s). The static breakdown voltage was estimated based on dynamic breakdown voltage as a function of voltage increase rate. The applicability of certain di...
Source: Applied Radiation and Isotopes - March 22, 2022 Category: Radiology Authors: Mili ć M Pejović Emilija N Živanović Milan D Stojanovi ć Source Type: research

Performance of various mathematical functions for the in-situ relative detector efficiency towards its applicability for k < sub > 0 < /sub > IM-NAA
Appl Radiat Isot. 2022 Mar 14;184:110194. doi: 10.1016/j.apradiso.2022.110194. Online ahead of print.ABSTRACTThe in-situ relative detection efficiency strongly influences the characteristics of the k0-based internal monostandard neutron activation analysis (IM-NAA). In the present work, various mathematical functions were explored for the establishment of in-situ relative detector efficiency calibration and compared their performance based on the reduced chi-square (χ2) values. Among the various mathematical functions, the polynomial logarithm with 6th order was found to be associated with the minimum mean standard deviat...
Source: Applied Radiation and Isotopes - March 22, 2022 Category: Radiology Authors: Manish Chand J S Brahmaji Rao S K Samanta Rajendra Singh Shekhawat R Senthilvadivu G V S Ashok Kumar Kumar R Source Type: research

Statistical analysis of the periodic intermediate checks results on the standards used for calibrations of ionizing radiation dosimeters in a < sup > 60 < /sup > Co gamma ray beam
Appl Radiat Isot. 2022 Mar 16;184:110198. doi: 10.1016/j.apradiso.2022.110198. Online ahead of print.ABSTRACTPeriodic intermediate checks on the equipment used for calibration activity accredited for the conformity with the international norm ISO/IEC 17025 are an essential issue for monitoring the validity of calibration laboratory's results. These checks should be carried out according to a procedure defined by each accredited laboratory. The results of these checks should not exceed the acceptance criteria established in the laboratory and statistical techniques shall be applied to the reviewing of the results. In this w...
Source: Applied Radiation and Isotopes - March 21, 2022 Category: Radiology Authors: Iwona Grabska Wojciech Bulski Piotr Ulkowski Wioletta Ślusarczyk-Kacprzyk Pawe ł Kukołowicz Source Type: research

Comparison of several Li doped scintillators for measurement of neutron and γ radiation integral quantities
Appl Radiat Isot. 2022 Mar 12;184:110193. doi: 10.1016/j.apradiso.2022.110193. Online ahead of print.ABSTRACTFive types of scintillators for parallel detection of neutrons and γ were tested for their pulse shape discrimination ability. All detectors are based on 6Li (n,alpha)3H reaction. LiI, ZnS and polystyrene were used as scintillators. Tests were performed at different neutron and γ mixed fields (AmBe, Cf) using a small Hamamatsu photomultiplier and a Picoscope digitizer. A polystyrene-based ZnS + LiF detector was proven to be the most suitable for neutron-γ separation and similar sensitivity for both types of radia...
Source: Applied Radiation and Isotopes - March 21, 2022 Category: Radiology Authors: Milo š Tichý Ond řej Huml Source Type: research

Statistical analysis of the periodic intermediate checks results on the standards used for calibrations of ionizing radiation dosimeters in a < sup > 60 < /sup > Co gamma ray beam
Appl Radiat Isot. 2022 Mar 16;184:110198. doi: 10.1016/j.apradiso.2022.110198. Online ahead of print.ABSTRACTPeriodic intermediate checks on the equipment used for calibration activity accredited for the conformity with the international norm ISO/IEC 17025 are an essential issue for monitoring the validity of calibration laboratory's results. These checks should be carried out according to a procedure defined by each accredited laboratory. The results of these checks should not exceed the acceptance criteria established in the laboratory and statistical techniques shall be applied to the reviewing of the results. In this w...
Source: Applied Radiation and Isotopes - March 21, 2022 Category: Radiology Authors: Iwona Grabska Wojciech Bulski Piotr Ulkowski Wioletta Ślusarczyk-Kacprzyk Pawe ł Kukołowicz Source Type: research

Comparison of several Li doped scintillators for measurement of neutron and γ radiation integral quantities
Appl Radiat Isot. 2022 Mar 12;184:110193. doi: 10.1016/j.apradiso.2022.110193. Online ahead of print.ABSTRACTFive types of scintillators for parallel detection of neutrons and γ were tested for their pulse shape discrimination ability. All detectors are based on 6Li (n,alpha)3H reaction. LiI, ZnS and polystyrene were used as scintillators. Tests were performed at different neutron and γ mixed fields (AmBe, Cf) using a small Hamamatsu photomultiplier and a Picoscope digitizer. A polystyrene-based ZnS + LiF detector was proven to be the most suitable for neutron-γ separation and similar sensitivity for both types of radia...
Source: Applied Radiation and Isotopes - March 21, 2022 Category: Radiology Authors: Milo š Tichý Ond řej Huml Source Type: research

Application of a back propagation neural network model based on genetic algorithm to in situ analysis of marine sediment cores by X-ray fluorescence core scanner
Appl Radiat Isot. 2022 Mar 10;184:110191. doi: 10.1016/j.apradiso.2022.110191. Online ahead of print.ABSTRACTThe use of core scanners to perform X-ray fluorescence (XRF) spectroscopic analysis can only obtain the intensities of the target elements, which is not conducive for application in marine geology research. In this paper, using a core scanner, in situ measurements were performed on 15 components: Al2O3, SiO2, K2O, CaO, TiO2, MnO, Fe2O3, V, Cr, Zn, Rb, Sr, Y, Zr, and Ba. We explored the feasibility of reducing the effect of interstitial water by normalizing the original intensity using the intensity of Ca and the rat...
Source: Applied Radiation and Isotopes - March 20, 2022 Category: Radiology Authors: Qiang Li Gongping Tu Xuehua Zhang Sihai Cheng Tianbang Yang Source Type: research

Application of a back propagation neural network model based on genetic algorithm to in situ analysis of marine sediment cores by X-ray fluorescence core scanner
Appl Radiat Isot. 2022 Mar 10;184:110191. doi: 10.1016/j.apradiso.2022.110191. Online ahead of print.ABSTRACTThe use of core scanners to perform X-ray fluorescence (XRF) spectroscopic analysis can only obtain the intensities of the target elements, which is not conducive for application in marine geology research. In this paper, using a core scanner, in situ measurements were performed on 15 components: Al2O3, SiO2, K2O, CaO, TiO2, MnO, Fe2O3, V, Cr, Zn, Rb, Sr, Y, Zr, and Ba. We explored the feasibility of reducing the effect of interstitial water by normalizing the original intensity using the intensity of Ca and the rat...
Source: Applied Radiation and Isotopes - March 20, 2022 Category: Radiology Authors: Qiang Li Gongping Tu Xuehua Zhang Sihai Cheng Tianbang Yang Source Type: research

Isomeric cross sections of the (n, α) reactions on the < sup > 90 < /sup > Zr, < sup > 93 < /sup > Nb and < sup > 92 < /sup > Mo isotopes measured for 13.73  MeV-14.77 MeV and estimated for 10 MeV-20 MeV neutron energies
Appl Radiat Isot. 2022 Mar 11;184:110192. doi: 10.1016/j.apradiso.2022.110192. Online ahead of print.ABSTRACTIsomeric cross sections for the 90Zr(n, α)87Srm, 93Nb(n, α)90Ym and 92Mo(n, α)89Zrm reactions were measured at five neutron energies over the range 13.73 MeV-14.77 MeV using the activation technique in combination with high resolution γ-ray spectrometry. In the present work, the cross sections are measured for the 90Zr(n, α)87Srm and 93Nb(n, α)90Ym reactions are referenced to the 27Al(n, α)24Na standard reaction cross section whereas those measured for 92Mo(n, α)89Zrm reaction are referenced to the 56Fe(n, p...
Source: Applied Radiation and Isotopes - March 19, 2022 Category: Radiology Authors: F M D Attar G T Bholane T S Ganesapandy S D Dhole V N Bhoraskar Source Type: research