https://repository.auw.edu.bd/handle/123456789/740 Sat, 09 May 2026 11:39:56 GMT 2026-05-09T11:39:56Z https://repository.auw.edu.bd/handle/123456789/913 Monte Carlo Simulation and Experimental Determination of Tissue Phantom Ratio for Photon Beams delivered from Medical Linear Accelerator Meaze, AKM M H For an external radiotherapy procedure, the tissue phantom ratio (TPR20,10) is used as a photon beam quality index. This work presents an estimate of TPR20,10 using two cylindrical ionization chambers (NE2571 Farmer and PTW30013) in three high-energy photon modes (6, 10 and 15 MV) using both the Monte Carlo simulation and the experimental setup. The MCNPX (version 2.6.0) was used for the simulation of photon beams delivered by Varian-2300CD linac for the determination of TPR20,10 according to technical report series (TRS) 398. Again, applying the same protocol TPR20,10 values were measured experimentally with NE2571 Farmer and PTW30013 chambers for the same medical linear accelerator (LINAC). The differences of TPR20, 10 between MCNPX and experimental values were found for NE2571 Farmer chamber within 4.17 percent, 2.9 percent and 2.5 percent and similarly, these were within 3.89 percent, 2.71 percent and 1.98 percent at 6, 10 and 15 MV respectively for PTW30013. The TPR20,10 values simulated by MCNPX demonstrated close agreement with our experimental results. Fri, 01 Jan 2021 00:00:00 GMT https://repository.auw.edu.bd/handle/123456789/913 2021-01-01T00:00:00Z https://repository.auw.edu.bd/handle/123456789/912 Suitability of Chambers in Relative Dose Measurement of Small Fields for Accelerated Photon Delivered by a Medical Linear Accelerator Meaze, AKM Moinul Haque Introduction: Using the small field in modern radiotherapy, the present study aimed at measuring the relative dosimetry (scattering factor, percentage depth dose (PDD), and profile of penumbra) with ionization (FC65-G, CC13, CC01) and diode (razor) chambers. Material and Methods: Applying TRS-398 in Varian ClinacTM IX-5982 for 6 MV photon beams, the conditions (pressure, temperature, direction, polarity) were kept the same for a set of field sizes (1 × 1, 2 × 2, 3 × 3, 4 × 4, 5 × 5, 7 × 7, and 10 × 10 cm2 ), and relative dosimetry was performed at the North-East Cancer Hospital, Sylhet, Bangladesh. Results: During the output factor measurement in small fields, the razor showed better results than CC13. Taking CC01 as a standard in small fields, the data obtained from the study showed a good agreement with those of the previously published works. Conclusion: Razor, with extremely small active volume, was very much suited for small field dosimetry, except for PDDs. Fri, 01 Jan 2021 00:00:00 GMT https://repository.auw.edu.bd/handle/123456789/912 2021-01-01T00:00:00Z https://repository.auw.edu.bd/handle/123456789/911 3rd INTERNATIONAL SYMPOSIUM ON BIODIVERSITY RESEARCH Meaze, AKM Moinul Haque Asian Palmyra palm (Borassus Flabellifer), a gigantic fan-shaped tree that spreads out to large areas, mainly in South Asian countries such as Tamilnadu and Kerala, northern regions of Srilanka, Bangladesh, Myanmar, Thailand, and Cambodia is an important tree that contributes a lot to biodiversity and sustainability. From ancient times, it has been widely discussed and praised in Tamil classical Sangam literature, which has discussed 801 uses of Palmyra palm (Tala Vilasam). Palmyraculture (in Tamil, Panaiyaanmai) is the self-reliant community living and lifestyle based on Asian palmyra palm towards sustainable development. From ‘Palmyraculture’ we can promote Sustainable Development through three main pillars: Environment, Economic, and Social. In terms of Environmental Sustainability, Palmyra acts as the main breeding and nesting site for various epiphytes, reptiles, birds and plants and also, it is a natural rainwater harvesting system that stores up water and can turn an arid region into a fertile one. Recent research done on plantations of Tamarind, Pineapple, Cashew, Portia and Neem with young palmyra plants showed that the plants near the palm did not need to be watered in intervals since, the palmyra was the major provider of water, and nutrients. Similarly, its leaves provided shade for plants around its vicinity. Due to its immense ability to nurture plants and animals, it is often mentioned as a “keystone species''. In addition, it is also known as “a multi-purpose tree with a great utility because of its wide varieties of commercial uses it has from both its edible parts such as jaggery, sap, toffee, wine, sugar and from non-edible products such as leaves, trunk, tuber coat to make mats, baskets, coir, toys, house construction. In addition to this, Palmyra toddy, a nutritious drink, has gained special attention recently due to its ban in Tamilnadu. When branded alcohol takes months and years to ferment, toddy just takes some days to make a healthy drink unlike the prior. However, overall products from palmyra contribute significantly to the GDP of a country and also in attaining Economic sustainability that can create a huge impact in the lives of rural communities. Social Sustainability is another key parameter in SDG that can be obtained by depending on the Palmyra tree for nutritious food, shelter and cultural activities. With these parameters, palmyra palm attains a maximum number of SDG goals that directly or indirectly play a major role in attaining equilibrium between present needs and the demand of future generations. Asian Palmyra palm can also be called as “a tree of life” that provides us with all the basic things needed for the survival of humankind on the earth, that includes air, water, food, medicine, shelter, clothing, energy, education, innovation, employment, sports and games, aestheticism, biodiversity and ecosystem development, green economy, and spiritual enlightenment. This paper will cover the wide aspects of how the palmyra tree balances the three pillars of Sustainable Development and its importance towards bringing in sustainability by comparing its services through SDG’s. Fri, 01 Jan 2021 00:00:00 GMT https://repository.auw.edu.bd/handle/123456789/911 2021-01-01T00:00:00Z