Gamma response study of radiation sensitive MOSFETs for their use as gamma radiation sensor

2016 ◽  
Author(s):  
Saurabh Srivastava ◽  
Bharti Aggarwal ◽  
Arvind Singh ◽  
A. Vinod Kumar ◽  
Anita Topkar
Keyword(s):  
Gamma Radiation ◽  
Radiation Sensor

scholarly journals A Novel Portable Gamma Radiation Sensor Based on a Monolithic Lutetium-Yttrium Oxyorthosilicate Ring

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3376
Author(s):  
Xi Zhang ◽  
Qiangqiang Xie ◽  
Siwei Xie ◽  
Xin Yu ◽  
Jianfeng Xu ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Gamma Rays ◽  
Detection Efficiency ◽  
Radiation Detection ◽  
Radiation Detectors ◽  
Large Field ◽  
Average Error ◽  
Detection Accuracy ◽  
Environmental Radiation ◽  
Radiation Sensor

Portable radiation detectors are widely used in environmental radiation detection and medical imaging due to their portability feature, high detection efficiency, and large field of view. Lutetium-yttrium oxyorthosilicate (LYSO) is a widely used scintillator in gamma radiation detection. However, the structure and the arrangement of scintillators limit the sensitivity and detection accuracy of these radiation detectors. In this study, a novel portable sensor based on a monolithic LYSO ring was developed for the detection of environmental radiation through simulation, followed by construction and assessments. Monte Carlo simulations were utilized to prove the detection of gamma rays at 511 keV by the developed sensor. The simulations data, including energy resolutions, decoding errors, and sensitivity, showed good potential for the detection of gamma rays by the as-obtained sensor. The experimental results using the VA method revealed decoding errors in the energy window width of 50 keV less than 2°. The average error was estimated at 0.67°, a sufficient value for the detection of gamma radiation. In sum, the proposed radiation sensor appears promising for the construction of high-performance radiation detectors and systems.

Investigation of iron (II) phthalocyanine based schottky device as gamma radiation sensor

2004 ◽  
Vol 38 (2) ◽  
pp. 205-209 ◽  
Author(s):  
M.S. Roy ◽  
Manish Kumar ◽  
Pratibha Jaiswal ◽  
G.D. Sharma
Keyword(s):  
Gamma Radiation ◽  
Radiation Sensor ◽  
Schottky Device

scholarly journals DETECTOR SIMULATION FOR RADIATION MONITORING SYSTEMS

2020 ◽  
pp. 5-13 ◽  
Author(s):  
O.V. Banzak ◽  
O.V. Maslov ◽  
V.A. Mokritsky ◽  
O.I. Leschenko
Keyword(s):  
Gamma Radiation ◽  
Radiation Detector ◽  
Field Method ◽  
Structural Defects ◽  
Physical Analysis ◽  
Radiation Sensor ◽  
Mobility Of Charge Carriers ◽  
A Charge ◽  
Radiation Sensors ◽  
Detector Simulation

In the work, a model of primary transducer - gamma radiation sensor has been created. It is based on the following properties of a semiconductor crystal: maximum quantum efficiency; maximum mobility of charge carriers; minimum density of structural defects; maximum values of resistivity and density. The combination of these properties provides significant sensor sensitivity with a minimum crystal size. The inconsistency of this combination must be eliminated both in the process of crystal fabrication (for example, a high-resistance crystal is obtained by the simultaneous use of purification, components, and compensating doping) and subsequent processing by the methods proposed in this work (thermal field method, ionization annealing). To register small signals, it is necessary to have minimal loss currents at sufficiently high voltages applied to the sensor. This means that the semiconductor material must be highly resistive. Among the known materials for gamma radiation sensors, single crystals of CdxZn1-xTe solid solutions have an optimal combination of the properties listed above and the possibilities of their production. The creation of a model gamma-radiation detector as a single system of primary and secondary converters is considered. It contains physical analysis and analytical presentation of processes occurring in CdZnTe-sensor and electronic preamplifier. It is shown that the charge collection in the sensor differs in time, which leads to a spread of signal pulses in duration and amplitude. In this regard, the model shows need to use a charge-sensitive preamplifier.

Effects of sterilization modes on the mechanical strengths of plaster of paris implants

1989 ◽  
Vol 47 ◽  
pp. 890-891
Author(s):  
K. Cowden ◽  
B. Giammara ◽  
T. Devine ◽  
J. Hanker
Keyword(s):  
Gamma Radiation ◽  
Calcium Sulfate ◽  
Significant Loss ◽  
Potassium Sulfate ◽  
Limiting Factors ◽  
Radiation Sterilization ◽  
Plaster Of Paris ◽  
Hardness Tester ◽  
Dry Heat ◽  
Calcium Sulfate Hemihydrate

Plaster of Paris (calcium sulfate hemihydrate, CaSO4. ½ H2O) has been used as a biomedical implant material since 1892. One of the primary limiting factors of these implants is their mechanical properties. These materials have low compressive and tensile strengths when compared to normal bone. These are important limiting factors where large biomechanical forces exist. Previous work has suggested that sterilization techniques could affect the implant’s strength. A study of plaster of Paris implant mechanical and physical properties to find optimum sterilization techniques therefore, could lead to a significant increase in their application and promise for future use as hard tissue prosthetic materials.USG Medical Grade Calcium Sulfate Hemihydrate Types A, A-1 and B, were sterilized by dry heat and by gamma radiation. Types A and B were additionally sterilized with and without the setting agent potassium sulfate (K2SO4). The plaster mixtures were then moistened with a minimum amount of water and formed into disks (.339 in. diameter x .053 in. deep) in polyethylene molds with a microspatula. After drying, the disks were fractured with a Stokes Hardness Tester. The compressive strengths of the disks were obtained directly from the hardness tester. Values for the maximum tensile strengths σo were then calculated: where (P = applied compression, D = disk diameter, and t = disk thickness). Plaster disks (types A and B) that contained no setting agent showed a significant loss in strength with either dry heat or gamma radiation sterilization. Those that contained potassium sulfate (K2SO4) did not show a significant loss in strength with either sterilization technique. In all comparisons (with and without K2SO4 and with either dry heat or gamma radiation sterilization) the type B plaster had higher compressive and tensile strengths than that of the type A plaster. The type A-1 plaster however, which is specially modified for accelerated setting, was comparable to that of type B with K2SO4 in both compressive and tensile strength (Table 1).

Use of the comet assay to measure DNA damage in cells exposed to photosensitizers and gamma radiation

1999 ◽  
Vol 96 (1) ◽  
pp. 143-146 ◽  
Author(s):  
J.-P. Pouget ◽  
J.-L. Ravanat ◽  
T. Douki ◽  
M.-J. Richard ◽  
J. Cadet
Keyword(s):  
Dna Damage ◽  
Comet Assay ◽  
Gamma Radiation ◽  
In Cells

National primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2019

2020 ◽  
pp. 8-12
Author(s):  
Alexandr V. Oborin ◽  
Anna Y. Villevalde ◽  
Sergey G. Trofimchuk
Keyword(s):  
Gamma Radiation ◽  
Energy Flux ◽  
Primary Standard ◽  
Average Energy ◽  
Ion Pair ◽  
X Rays ◽  
Exposure Rate ◽  
Ionization Chambers ◽  
Air Kerma ◽  
Air Kerma Rate

The results of development of the national primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2011 in 2019 are presented according to the recommendations of the ICRU Report No. 90 “Key Data for Ionizing-Radiation Dosimetry: Measurement Standards and Applications”. The following changes are made to the equations for the units determination with the standard: in the field of X-rays, new correction coefficients of the free-air ionization chambers are introduced and the relative standard uncertainty of the average energy to create an ion pair in air is changed; in the field of gamma radiation, the product of the average energy to create an ion pair in air and the electron stopping-power graphite to air ratio for the cavity ionization chambers is changed. More accurate values of the units reproduced by GET 8-2019 are obtained and new metrological characteristics of the standard are stated.

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