AIP Conference Proceedings [AIP Publishing LLC ADVANCING NUCLEAR SCIENCE AND ENGINEERING FOR SUSTAINABLE NUCLEAR ENERGY INFRASTRUCTURE: Proceeding of the International Nuclear Science, Technology and Engineering Conference 2015 (iNuSTEC2015) - Negeri Sembilan, Malaysia (17–19 August 2015)] - The effect of gamma irradiation on chitosan and its application as a plant growth promoter in Chinese kale (Brassica alboglabra)