2026-06-12T01:35:43Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/00006861 2021-12-13T01:22:50Z 1582963674932 1582963674932:1597397207532 user-miit

The Studies on the Changes of Properties of a Myanmar Lesser used Timber Species Following Gamma Irradiation Kay Thwe Kywe Aye Myo Myo Aung The irradiation processing of polymeric materials is a main step in certain modern technologies. On the other hand, polymeric materials included in parts of irradiation facilities or in nuclear plants are subjected to the action of ionizing radiation in the presence of air. These facts explain the high interest in the study of radiation effects on polymers. Timber is a polymeric material and also it is successfully employed as a structural or decorative material in a wide variety of application. In Myanmar, timber is extensively employed as a structural and decorative material in a wide variety of applications as well as being a major export commodity. In fact, the commercially important timber species will become scarce due to the development of wood- based industries and increased domestic and international trade. Thus, the Forest Department has considered that commercially important timber should be substituted by other appropriate woody species or by some lesser-used timber species (LUS). In collaboration with International Tropical Timber Organization (ITTO), the Forest Department has undertaken a project on “Introducing M y a n m a r ’ s L e s s e r -Used T imb e r S p e c i e s t o t h e World Market”. The radiation techniques for the improvement of the quality of these LUS are new to us. In this project, the changes in physical properties such as dimensional changes and specific gravity, and mechanical properties such as static bending test, compression tests and hardness tests of Leza, a lesser used Myanmar timber species, following radiation processing with 10kGy gamma radiation has been studied. The timber samples were obtained from Timber Physical Section and Timber Mechanical Section, Forest Research Institute (F.R.I), Yezin and these samples were informed to be collected from Kabaung Reserve Forest of Taunggu Forest Division. The results for these tests were analyzed at 95 percent confidence level by using Statistical Analysis System. The results revealed that although the physical properties of Leza are not significantly changes at 95 percent confidence level, the results for strength properties of Leza are significantly changed at 95 percent confidence level after gamma radiation. 2019-05-24 http://hdl.handle.net/20.500.12678/0000006861 https://meral.edu.mm/records/6861