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NEGRÃO, Bianca G. Effects of gamma radiation for quarantine treatment and analysis of seed popping expansion index (Zea mays L. Var Everta). 2018. Dissertação (Mestrado em Tecnologia Nuclear) – Instituto Pesquisas Energéticas e Nucleares – IPEN-CNEN/SP. São Paulo. The quarantine treatment aims to eliminate or reduce the level of pest population that can be associated with products such as grains or fruits. Many post-harvest losses in stored products result from the degradation and deterioration caused by insects. Considering this context, the objective of this work was to evaluate the effects of gamma radiation on popcorn seeds and on the popping expansion index. The grains were purchased in the retail trade of the city of São Paulo, later infested in the Laboratory of Food Irradiation at IPEN-CNEN/SP, and then submitted to different doses of gamma radiation: 0,025; 0,050; 0,075 and 0,100 kGy for phytosanitary purposes and doses of 1, 5, 10 and 15 kGy for Popping Expansion Index (PEI) analysis. The samples were irradiated in the Cobalt-60 irradiator; model Gammacell 220 with a dose rate of 1.4 kGy/ h at the IPENCNEN/SP Radiation Technology Center (CTR). Each treatment consisted of 3 replicates with 100 grams of corn grains. The samples were conditioned and stored at a temperature of 25 ± 2°C and relative humidity of 70 ± 5%. Then, the counts of emerged insects were carried out. All phases: egg, larva and pupa were sensitive to gamma radiation. A dose of 0.100 kGy was sufficient to control the emerged of adult and should be used to ensure quarantine treatment of Sitophilus zeamais on stored popcorn grains. The 15 kGy dose was the only one that presented values of expansion capacity index (26.7 mL/g) below that stipulated by the Brazilian legislation (30 mL/g). It Was concluded that, for the purpose of quarantine treatment and technological improvement, for popping index the appropriate dose is 0,1 kGy in popcorn seeds.

Efeitos da radiação gama visando tratamento quarentenário e análise do índice de capacidade de expansão de sementes do milho pipoca (Zea mays L. var. everta)