The in-pile dosimetry of mixed radiations in the core of Triga Mark III nuclear reactor at ININ-Mexico

The isothermic calorimeters, one containing graphite and the other aluminum, were used to measure ionizing radiation doses received in three experimental positions of a TRIGA Mark III reactor core. The dose rates in the positions studied were found to be the following: Central Thimble (CT): (12.8+-0.3) x 105 Gy/h, 64% γ: 36% nsub(f); In-Core Isotope Production Facility (I-CIPF): (5.0+-0.1) x 105 Gy/h, 76%: 24% nsub(f); In-Pool Isotope Production Facility (I-PIPF): (2.0+-0.1) x 105 Gy/h, 80% γ: 20% nsub(f). The solid oxalic acid dosimetric technique was also utilized. Radiolytic decomposition constant (a) values observed in the experimental positions were the following: asub(CT)=17.64+-0.01 MGy; asub(I-CIPF)=17.4+-0.4 MGy; asub(I-PIPF)=17.6+-0.4 MGy. (author)