ACTIVATION RATE UNIFORMITY IN A BILATERAL IVNAA FACILITY FOR TWO ANTHROPOMORPHIC PHANTOMS

作者：Hakimabad Hashem Miri^*; Motavalli Lalle Rafat; Shahri Keihandokht Karimi

来源：Nuclear Technology & Radiation Protection, 2010, 25(2): 69-77.

DOI：10.2298/NTRP1002069M

• activation rate uniformity
• prompt gamma-ray IVNAA
• bilateral configuration
• MCNP
• phantom

Activation rate uniformity is the first property which is considered in the design of a prompt gamma-ray in vivo neutron activation analysis facility. Preliminary studies on the activation rate distribution in the body can be done by use of Monte Carlo codes, such as the MCNP. In this paper, different bilateral configurations of an IVNAA system are considered in order to improve the activation rate uniformity in a water phantom measuring 32 cm x 100 cm x 16 cm. In the best case, uniformity parameters are U = 1.003 and R = 1.67, with the mean activation rate of 1.85.10(-6) cm(-3). In more accurate calculations, the water phantom is replaced by a body model. The model in question is a 5 year-old ORNL phantom filled with just soft tissue. For uniformity studies, the internal organs are not simulated. Finally, uniformity parameters in this case are U = 1.005 and R = 12.2.

• 出版日期2010-9