Abstract
A series of storage tests is conducted comparing paddy with brown rice, cold storage with ambient temperature one, under the dose of 0 krad, 30 krad, 300 krad and 1 Mrad irradiation by Co-60.
Overall count of survived bacteria for a grain is at the order of 106 with non-irradiated grain, on the other hand 105 with 30 krad, 104 with 300 krad and 103 with 1 Mrad irradiated one respectively, although the count decreases as the storage period increases in any cases. The decreasing rate of bacteria is less in case of paddy and cold storage than that of brown rice and ambient temperature storage. Mold disinfected grain decreases absolutely under the dose of 1 Mrad, and it increases in any cases as the storage period prolongs.
Germination ratio does not show significant change in cold storage, however, it decreases evidently as the storage period goes by in ambient temperature storage.
Significant deterioration of organoleptic evaluation is observed at 30 krad irradiated rice, but it recovers after the storage 10 months.
The irradiation technique may be useful as a supplement of common grain storage method which applied drying and storing in low temperature.
