Spectroscopy and Optimizing Semiconductor Detector Data Under X and γ Photons Using Image Processing Technique

2021

Preprint

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Objective: The collimators in which the various geometrical configurations have been suggested to optimize the sensitivity and resolution have a key role in acquiring the qualified images in nuclear medicine towards a better recognition of some diseases. Methods: In this study, a new configuration as a geometrical combination of the conical, cylindrical and spherical (CCS) volumes for parallel hole collimators which is assessed by using the volumetric-parametric method has been introduced to improve point spread function (PSF) being the collimators response on the radioactive point source. It has been simulated by the MCNPX code at the various energies values of the point source along with the traditional collimator in which included the cylindrical volume only. Results: The PSF will transmogrify from a delta function to a distribution which can correlate with a Gaussian distribution, while the scattered gamma rays were increased. The simulation results have indicated that the PSF in the CCS configuration is narrower than that of the cylindrical one at all the energies, leading the improvement of the resolution. Also, the theoretical results are agreement with the simulated ones. The more the energy value of the source, the more broaden the PSF will be due the more penetration strength. The narrower the PSF, the better the qualified image will be. Conclusion: This method may be employed to determine the accurate attenuation coefficient of absorbers as well.

Section: Discussionmentioning

confidence: 99%

Improvement of the Point Spread Function by Collimators’ New Configuration in Nuclear Medicine

Ashoor

2021

Preprint

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“…The purpose of irradiating tissues is the recognition of abnormalities and the treatment of abnormal tissues with a minimum dose delivered to the other healthy tissues. This may be achieved using suitable shielding, correct deformation of the normal tissues, or both [13][14][15][16][17][18][19][20][21][22]. Here, the deformation from the CC to CR shape was simulated by the Monte Carlo method and the dose and KVs were compared between shapes.…”

Section: Discussionmentioning

confidence: 99%

Assessment of absorbed dose in deformed breast tissue by Monte Carlo simulation

Ashoor¹,

2020

SN Appl. Sci.

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The main concern in radiotherapy of the breast is covering the target volume and increasing the dose absorbed by tumor cells. The aim is intended to provide a pertinent moldable perspective to the currently utilized methods of calculating Kerma value (KV) as a function of distance from nipple. The KV in the breast deformed for two shapes, such as cylindrical-conical (CC) and cubic-rectangular (CR), was simulated using Monte Carlo method with appropriate assumptions and a 2 MeV X-ray system. The source was positioned near the right breast. Simulation results demonstrated that decreasing height of CR shape reduced the absorption and scattering cross-sections as well as the KV. Relative accumulated dose for a CR-shaped breast was 96.89% lower than that for CC-shaped breast. The KV in the breast decreased with increasing distance from the nipple (depth) for both shapes, but for right and left breasts in CR form was independent from depth with no change between breasts as depth increased. The relative difference in KV between the breasts was significant for CR shape, in which the KV was high at low depths and decreased linearly with increasing depth. Tumors are often differentiable in the breast form; hence, the normal breast should be deformed into CR shape to improve the degree of tissue protection in adjuvant radiotherapy. It is expected that the dose absorbed by the gland will be more strongly increased for CC shape rather than for CR shape in radiation therapy.

“…Some systems are used to monitor the radiation shielding efficiency [47, 48] or to measure the fast neutrons besides gamma rays [49, 50, 51, 52, 53, 54, 55, 56]. In such systems, the use of nanomaterials against radiation would be preferable.…”

Section: Discussionmentioning

confidence: 99%

Introducing a novel coefficient on mixed-nanoparticles material: relationship between the theoretical and experimental densities

Ashoor

Sarkhosh

2019

Heliyon

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Nanoparticles (NPs) indicating a unique potential in bioradiation and nuclear reactor shielding are employed in many fields due to their particular specifications leading improving the mechanical properties as well as pore structure of the concrete-shield. The aim was to introduce a novel coefficient ( ), namely the experimental to theoretical density ratio for mixed-NPs material at various nanoparticles percent concentrations ( ) based on pure mathematical aspects along with the some suitable physical purposes by Monte Carlo method. The change in the mixture density to the change in is always proportional to the value. The density will become maximum at the in which the physical, morphological and chemical features of NPs along with the amounts of voids in the material have a key role over estimating porosity percentage. The NPs’ separation probability as born-cascaded-pairs towards very small radii may be formulated as where and are constant values. In conclusion, the theoretical results may be experimentally used in future work for different applications such as designing shield at a nuclear facility.