A Correlation of the Co-60 and Beta-emitting Radionuclides in the Activated Concrete of KRR-2

作者：Kang Mun Ja^*; Hong Sang Bum; Chung Un Soo; Park Jin Ho; Chung Kun Ho; Choi Geun Sik; Lee Chang Woo

来源：Journal of Nuclear Science and Technology, 2008, 658-661.

• activated concrete
• correlation
• cobalt-60
• tritium
• carbon-14
• iron-55
• nickel-63

Dismantling work of the Korean Research Reactor-2 (KRR-2), including its shielding concrete, was completed in 2006. Some parts of the shielding concrete of the KRR-2 were activated by a thermal neutron reaction during operation of the reactor. The levels of gamma and beta-emitting radionuclides in the dismantled concrete are required to be measured and evaluated. The samples were collected from the inner surface to 90 cm horizontal depth on one side of the shielding concrete. The gamma-emitting radionuclides in the activated concrete were analyzed by using HPGe spectrometer. The radioactivities of H-3 and C-14 were determined by a commercially available tube furnace and liquid scintillation counter and Fe-55 and Ni-63 by a combined method of an extraction chromatography and a liquid scintillation analysis, A correlation of the measurement results based on the Co-60 radioactivity was investigated to estimate the radioactivity level of the activated concrete. The radioactivities of H-3 and 55Fe in the dismantled concrete revealed a good correlation with that of Co-60. The correlation formulas are y = 0.77x + 1.68 (r=0.984) and y = 0.96x +1.26 (r=0.995), respectively. In the case of C-14, the correlation is represented as y = 0.60x -1.82 (r=0.998) in the higher range of activity.

• 出版日期2008-6