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Detection Efficiency of Gamma Cameras with Different Absorber Materials

Ahmed Alharbi

Department of Physics, Qassim University, Qassim 51452, Kingdom of Saudi Arabia

qu.c@hotmail.com

Abstract: Nuclear medicine has a significant role in medical imaging applications which utilizes a certain radioisotope to diagnose different types of diseases. The most common device used in clinics among other imaging detectors is a gamma camera (GC). Such a device is used for different diagnosing purposes including a bone scan, investigating the asymmetries of any organ in the body as well as diagnose cardiac and kidneys abnormalities. In this study, different clinical obtained from different gamma cambers were investigated. The obtained result revealed that gamma cameras have different responses due to various parameters including spatial resolution, the collimator resolution, the intrinsic resolution, as well as the distances from the patients. These parameters highly affect the image quality and details. Furthermore, the comparison between the images obtained by gamma cameras with an X-ray scan showed that GC has a better contras resolution than X-ray which can effectively identify the abnormalities in the projected organs. The processes performed in this lab work can be followed by future work in order to determine the abnormality and asymmetries of any organ of the patent body by using a suitable gamma camera either (HRGP) or (LEHS) ones.

[Ahmed Alharbi. Detection Efficiency of Gamma Cameras with Different Absorber Materials. Nat Sci 2024,22(3):1-9]. ISSN 1545-0740 (print); ISSN 2375-7167(online). http://www.sciencepub.net/nature 01. doi:10.7537/marsnsj220324.01.

Keywords: Gamma-rays ; Shielding materials; Gamma Cameras

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Marketing Strategies of Finfish and Shellfish in the North-Eastern Region of Bangladesh: An Empirical Study

Mehedi Azam, Md. Bokthier Rahman, Mst. Ruma, S.M. Oasiqul Azad, Md. Shahin Alom and Md. Yusuf Ali

Department of Aquaculture, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Banladesh

Department of Fisheries Technology, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Banladesh

Department of Fisheries Management, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Banladesh

Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Banladesh

Correspondence: bokthierfs@gmail.com

Abstract: Sylhet district, the largest states of Bangladesh having vast freshwater resources offering considerable fish and fishery products. Several markets and super shop hence developed to continue fish related business. Therefore, the study was undertaken to know the present status of fish markets, marketing channels, sources of fish, price of available fish, gross and net margin, constraints of markets and some recommendations for improvement by employing PRP tools (FGD, Cross-check interviews, face to face interviews etc.) for a period of six months from June 2015 to November 2015. The study revealed that in supply chain about 5% consumers received fish and fishery related products from fish producers/capturers directly and rest 95% fishes reached to the consumer levels through intermediaries (beparis, aratdars, wholesalers and retailers etc.). The price of available fish was ranged from 100-800tk/kg. The price variation of fish species was found correlated with the availability of species, long fish supply chain, size of fish, season and most commonly consumer preferences. About 55% fish species were local origin and 45% come from different part of the country. The gross margin of paiker, wholesaler and retailer was 800, 400, 1100 taka/quintal whereas net margin was 600, 320 and 960 taka/quintal, respectively. It was found that 45% consumer not prefers to take fish in fillet form and rest 55% accepted fish fillet for consumption. Major constraints of the study areas were poor drainage, transportation, icing facilities, unhygienic environment. Shortening of fish market channel, effective price policy, more ice-plant, maintaining proper ratio of fish and ice and development of good road and transport networks are some important measures to over the existing problems of fish market in Sylhet district.

[Mehedi Azam, Md. Bokthier Rahman, Mst. Ruma, S.M. Oasiqul Azad, Md. Shahin Alom and Md. Yusuf Ali. Marketing Strategies of Finfish and Shellfish in the North-Eastern Region of Bangladesh: An Empirical Study. Nat Sci 2024,22(3):10-18]. ISSN 1545-0740 (print); ISSN 2375-7167 (online). http://www.sciencepub.net/nature. 02. doi:10.7537/marsnsj220324.02.

Keywords: Sylhet district, fish markets, marketing channels, price, intermediaries, gross margin, net margin, constraints, measures

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