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Synthesis and characterization of a soft-tissue substitute for neutron dosimetry

中性子線量測定用ファントム軟組織等価材料の合成と特性評価

津田 修一  ; 遠藤 章   ; 山口 恭弘

Tsuda, Shuichi; Endo, Akira; Yamaguchi, Yasuhiro

中性子線量測定用の物理ファントムを開発するために、人体軟組織等価材料を合成し、その特性試験を行った。$$^{252}$$Cf中性子源を用いて測定した材料内の吸収線量分布は、モンテカルロ放射線輸送計算コードMCNPによる計算結果と一致した。同様の手法で0.1~14MeVの中性子に対する吸収線量分布のエネルギー特性を計算した結果、開発した材料は14MeVまでのエネルギー範囲において人体軟組織に等価な特性を有することがわかった。

To develop a physical phantom for neutron dosimetry, a solid soft-tissue substitute was synthesized. The hydrogen and oxygen compositions of the synthesized tissue substitute, NAN-JAERI, are similar to those of the soft tissue in ICRU Report 44. To examine the radiation characteristics of the new soft-tissue substitute, absorbed dose distributions in NAN-JAERI were measured using a $$^{252}$$Cf neutron source. The measured absorbed dose distributions of neutrons and photons agree with those calculated by a Monte Carlo simulation code MCNP. The agreement between the experiment and the simulation verifies this method of evaluating the soft-tissue equivalence of NAN-JAERI for $$^{252}$$Cf neutrons. Similar simulations for some mono-energetic neutron sources showed that the newly developed tissue substitute has soft-tissue equivalent characteristics in the neutron energy range up to 14 MeV, in terms of the absorbed dose distributions in a slab phantom.

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パーセンタイル:10.89

分野:Nuclear Science & Technology

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