Calculation of the half life for the thermoluminescent signal of Beryllium oxide
Appl Radiat Isot. 2022 May 17;186:110291. doi: 10.1016/j.apradiso.2022.110291. Online ahead of print.ABSTRACTHalf-life is one of the fundamental parameters to characterize the thermoluminescent (TL) response in ionizing radiation dosimetry. In general, there are two types of important half-lives to model the phenomenon of thermoluminescence (TL). The first type of half-life is the time required for the concentration of trapped charge carriers in a single trap to decrease to half its initial value; this type of half-life is generally denoted as τ1/2. Experimentally, the loss of charge carriers and the corresponding half-li...
Source: Applied Radiation and Isotopes - May 26, 2022 Category: Radiology Authors: Juan Azor ín-Nieto Claudio Furetta Enrique Ortiz-Mart ínez Claudia Azorin-Vega Source Type: research

Mouthpiece polymer-gel dosimeter for in vivo oral dosimetry during head and neck radiotherapy
In this study, we developed a mouthpiece-type gel dosimeter to prevent the oral mucositis caused by the perturbation effect of dental alloys in the radiotherapy of the head and neck regions and to enable in vivo dosimetry. Understanding the dose distribution in the oral cavity during radiotherapy helps identify the possible site for oral mucositis during treatment. Here agarose, which has a higher melting point than gelatin, was added as a coagulant to stabilize the shape of the dosimeter. The strength and dose response of the dosimeter were investigated. The strength was measured at room temperature, 20°C-40 °C, which i...
Source: Applied Radiation and Isotopes - May 26, 2022 Category: Radiology Authors: Hiraku Fuse Satoshi Oyama Tatsuya Fujisaki Kenji Yasue Koichi Hanada Fumihiro Tomita Shinji Abe Source Type: research

Thermoluminescence glow curve analysis of Ca < sub > 3 < /sub > Y < sub > 2 < /sub > B < sub > 4 < /sub > O < sub > 12 < /sub > phosphor prepared using combustion method
Appl Radiat Isot. 2022 May 20;186:110299. doi: 10.1016/j.apradiso.2022.110299. Online ahead of print.ABSTRACTCa3Y2B4O12 (CBYO) phosphor was synthesized using a gel combustion method. X-ray diffraction (XRD) measurement confirmed a single-phase structure (space group Pnma (62)) of synthesized compound. TL measurements were conducted between room temperature (RT) and 450 °C at a heating rate of 2 °Cs-1. Significant glow peaks were observed at 64, 116, and 242 °C in CYBO phosphor sample exposed to different beta doses. In the range of 0.1-100 Gy, the TL intensity of the glow peak displayed good linearity. Different methods...
Source: Applied Radiation and Isotopes - May 25, 2022 Category: Radiology Authors: J Hakami M Sonsuz U H Kaynar M Ayvacikli M Oglakci M Y üksel M Topaksu N Can Source Type: research

Design and characterization of third-order Sallen-Key digital filter in nuclear signal processing
Appl Radiat Isot. 2022 May 20;186:110277. doi: 10.1016/j.apradiso.2022.110277. Online ahead of print.ABSTRACTThe Gaussian filter shaping circuit is widely used in the nuclear pulse signal processing due to its good performance in amplitude extraction and pulse counting. A third-order Sallen-Key (3rd S-K) filter shaping circuit is designed based on a RC integrator and a second-order Sallen-Key (2nd S-K) circuit. According to the digital 3rd S-K, the transfer functions is derived in the Laplacian domain, and the numerical recurrence model is analyzed and researched, the purpose is to obtain its transfer function and amplitud...
Source: Applied Radiation and Isotopes - May 24, 2022 Category: Radiology Authors: Huai-Qiang Zhang Yun-Chen Qian He Chen Hong-Tao Shi Source Type: research

Defining an equivalent geometry for Monte Carlo calculations of a high-purity Ge detector with high relative efficiency using a genetic algorithm
Appl Radiat Isot. 2022 May 18;186:110295. doi: 10.1016/j.apradiso.2022.110295. Online ahead of print.ABSTRACTDetailed geometric information of a high-purity Ge (HPGe) detector is a very important issue for Monte Carlo simulation of the detector. Commonly, users have no geometric information about the detector and information given by the manufacturer is not completely valid for simulation. An equivalent geometry of detector, the parameters of which can be used for Monte Carlo simulation, is optimised using a genetic algorithm for a large-volume HPGe detector in this study. A mixed-point gamma calibration standard, emitting...
Source: Applied Radiation and Isotopes - May 24, 2022 Category: Radiology Authors: Ayhan Y üksel Mehmet Tombako ğlu Source Type: research

Design and characterization of third-order Sallen-Key digital filter in nuclear signal processing
Appl Radiat Isot. 2022 May 20;186:110277. doi: 10.1016/j.apradiso.2022.110277. Online ahead of print.ABSTRACTThe Gaussian filter shaping circuit is widely used in the nuclear pulse signal processing due to its good performance in amplitude extraction and pulse counting. A third-order Sallen-Key (3rd S-K) filter shaping circuit is designed based on a RC integrator and a second-order Sallen-Key (2nd S-K) circuit. According to the digital 3rd S-K, the transfer functions is derived in the Laplacian domain, and the numerical recurrence model is analyzed and researched, the purpose is to obtain its transfer function and amplitud...
Source: Applied Radiation and Isotopes - May 24, 2022 Category: Radiology Authors: Huai-Qiang Zhang Yun-Chen Qian He Chen Hong-Tao Shi Source Type: research

Defining an equivalent geometry for Monte Carlo calculations of a high-purity Ge detector with high relative efficiency using a genetic algorithm
Appl Radiat Isot. 2022 May 18;186:110295. doi: 10.1016/j.apradiso.2022.110295. Online ahead of print.ABSTRACTDetailed geometric information of a high-purity Ge (HPGe) detector is a very important issue for Monte Carlo simulation of the detector. Commonly, users have no geometric information about the detector and information given by the manufacturer is not completely valid for simulation. An equivalent geometry of detector, the parameters of which can be used for Monte Carlo simulation, is optimised using a genetic algorithm for a large-volume HPGe detector in this study. A mixed-point gamma calibration standard, emitting...
Source: Applied Radiation and Isotopes - May 24, 2022 Category: Radiology Authors: Ayhan Y üksel Mehmet Tombako ğlu Source Type: research

Encapsulation of < sup > 67 < /sup > Cu therapeutic radiometal in luminescent lanthanide phosphate core and core-shell nanoparticles
Appl Radiat Isot. 2022 May 18;186:110296. doi: 10.1016/j.apradiso.2022.110296. Online ahead of print.ABSTRACTCopper-67 (67Cu) has physical characteristics useful for both therapy and imaging. However, its applicability has been hindered by the complexity of obtaining large quantities of a product with high specific activity. With the advancement of 67Cu production methods, suitable radioisotope carriers are sought. Lanthanide phosphate nanoparticles have demonstrated their multifunctional characteristics for biomedical applications and, more recently, their potential in radiopharmaceuticals. Thus, we produced luminescent l...
Source: Applied Radiation and Isotopes - May 23, 2022 Category: Radiology Authors: J V Rojas R V Umretiya M C Molina-Higgins A Gawi S Gobalakrishnan J Zweit Source Type: research

Exploration of producing Uranium-232 for use as a tracer in uranium fuels
This study examines the production of 232U via neutron irradiation. Uranium-232 is considered for use as a tracer in nuclear fuel. However, a source of 232U is needed. This study examines the production of 232U via neutron irradiation of targets constructed out of either 231Pa or 230Th in the High Flux Isotope Reactor. HFIR targets were modeled in MCNP to determine 232U yield in protactinium and thorium targets. Flux tallies were used inside the targets to determine the neutron flux inside each target. This flux was then used in SCALE 6.2 ORIGEN to determine the 232U yield, as well as the buildup of the byproduct 233U. Sev...
Source: Applied Radiation and Isotopes - May 23, 2022 Category: Radiology Authors: Joshua Rhodes G Ivan Maldonado Source Type: research

Encapsulation of < sup > 67 < /sup > Cu therapeutic radiometal in luminescent lanthanide phosphate core and core-shell nanoparticles
Appl Radiat Isot. 2022 May 18;186:110296. doi: 10.1016/j.apradiso.2022.110296. Online ahead of print.ABSTRACTCopper-67 (67Cu) has physical characteristics useful for both therapy and imaging. However, its applicability has been hindered by the complexity of obtaining large quantities of a product with high specific activity. With the advancement of 67Cu production methods, suitable radioisotope carriers are sought. Lanthanide phosphate nanoparticles have demonstrated their multifunctional characteristics for biomedical applications and, more recently, their potential in radiopharmaceuticals. Thus, we produced luminescent l...
Source: Applied Radiation and Isotopes - May 23, 2022 Category: Radiology Authors: J V Rojas R V Umretiya M C Molina-Higgins A Gawi S Gobalakrishnan J Zweit Source Type: research

Exploration of producing Uranium-232 for use as a tracer in uranium fuels
This study examines the production of 232U via neutron irradiation. Uranium-232 is considered for use as a tracer in nuclear fuel. However, a source of 232U is needed. This study examines the production of 232U via neutron irradiation of targets constructed out of either 231Pa or 230Th in the High Flux Isotope Reactor. HFIR targets were modeled in MCNP to determine 232U yield in protactinium and thorium targets. Flux tallies were used inside the targets to determine the neutron flux inside each target. This flux was then used in SCALE 6.2 ORIGEN to determine the 232U yield, as well as the buildup of the byproduct 233U. Sev...
Source: Applied Radiation and Isotopes - May 23, 2022 Category: Radiology Authors: Joshua Rhodes G Ivan Maldonado Source Type: research

Studies of defect states and kinetic parameters of car windscreen for thermoluminescence retrospective dosimetry
Appl Radiat Isot. 2022 May 12;186:110271. doi: 10.1016/j.apradiso.2022.110271. Online ahead of print.ABSTRACTIn case of any natural disasters or technical failures of nuclear facilities, the surrounding media including human beings may receive unexpected radiation exposures. In such a situation, there is no viable way to know how much radiation dose is received by human beings. Realizing that motorized vehicles are parked at fixed but increasing distances within the nuclear installation and industrial environment, this study investigates the kinetic parameters of readily available car windscreens which form the basis to be...
Source: Applied Radiation and Isotopes - May 22, 2022 Category: Radiology Authors: Mayeen Uddin Khandaker S N Mat Nawi S E Lam D A Bradley S F Abdul Sani M R I Faruque Sabina Yasmin Abubakr M Idris Source Type: research

Studies of defect states and kinetic parameters of car windscreen for thermoluminescence retrospective dosimetry
Appl Radiat Isot. 2022 May 12;186:110271. doi: 10.1016/j.apradiso.2022.110271. Online ahead of print.ABSTRACTIn case of any natural disasters or technical failures of nuclear facilities, the surrounding media including human beings may receive unexpected radiation exposures. In such a situation, there is no viable way to know how much radiation dose is received by human beings. Realizing that motorized vehicles are parked at fixed but increasing distances within the nuclear installation and industrial environment, this study investigates the kinetic parameters of readily available car windscreens which form the basis to be...
Source: Applied Radiation and Isotopes - May 22, 2022 Category: Radiology Authors: Mayeen Uddin Khandaker S N Mat Nawi S E Lam D A Bradley S F Abdul Sani M R I Faruque Sabina Yasmin Abubakr M Idris Source Type: research

Electrochemical co-deposition of Ni-Gd < sub > 2 < /sub > O < sub > 3 < /sub > for composite thin targets preparation: Production of < sup > 155 < /sup > Tb as a case study
Appl Radiat Isot. 2022 May 16;186:110287. doi: 10.1016/j.apradiso.2022.110287. Online ahead of print.ABSTRACTIn the last years, 155Tb has attracted enormous interest due to its potential role in theranostics in nuclear medicine. To estimate its production yield, the aim of this study was to develop a method to prepare thin Gd-enriched-containing targets aimed at the 155Gd(d, 2n)155Tb nuclear cross section measurement. To this end, the electrochemical co-deposition method has been chosen to manufacture Ni-Gd2O3 composite targets. Several process parameters that have an impact on the deposit quality, have been investigated t...
Source: Applied Radiation and Isotopes - May 21, 2022 Category: Radiology Authors: Yizheng Wang Thomas Sounalet Arnaud Guertin F érid Haddad Nathalie Michel Etienne Nigron Source Type: research

Internal dosimetry studies of < sup > 177 < /sup > Lu-BBN-GABA-DOTA, as a cancer therapy agent, in human tissues based on animal data
In this study, the amount of absorbed dose in different organs (spleen, kidney, Lung, Pancreas, Heart, Adrenal, Intestine, Stomach, and Liver) were calculated for 1-MBq accumulation of 177Lu-BBN-GABA-DOTA in source organs (spleen, kidney, Lung, Pancreas, Heart, Adrenal, Intestine, Stomach, and Liver) using Monte Carlo Simulation (GATE code) with Zubal phantom. Moreover, compared with MIRD method, the results of the simulation showed considerable consistency. It was estimated that a 1-MBq administration of 177Lu-BBN-GABA-DOTA to the human body would result in an absorbed dose of 1.07E-02 mGy and 4.97E-02 (MIRD method) and 1...
Source: Applied Radiation and Isotopes - May 20, 2022 Category: Radiology Authors: S A Sahafi-Pour S P Shirmardi E Saeedzadeh S Baradaran M Sadeghi Source Type: research