Thesis (Ph.D.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Laser Applications in Enviromental metrology photochemistry , photobiology Agriculture

The main purpose of this study was to investigate the effects of laser and Ultraviolet irradiation on faba bean seed quality by studying the physical, mechanical, chemical, biological and optical properties of faba bean during storage periods. A laser light source was Helium- Neon laser with a wavelength 632.8nm and power of 8mW. Three exposure time of laser irradiation were of 15, 30, and 45min and 0min for treatment without irradiation were used on the Faba bean Giza 716 variety. A UVC source was 253.7 nm of wavelength and 36 watts of the power. Three irradiation times of UVC investigated were of 30, 60, and 90 min of exposure times were used, also and 0min for treatment without irradiation, After seed irradiation, they were stored for nine months and then four samples were taken from each treatment every three months and determined the chemical, physical, mechanical, biological and optical properties to observe the changes that occur in faba bean seeds during the storage period. The obtained result showed that the main dimensions, mass and bulk volume, true volume, protein, moisture content, fat, fiber, L and b* parameter were decreased by decreasing laser exposure time and UVC irradiation times and increasing the storage period

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