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Evaluation of radiation shielding ability of lead glass

含鉛ガラスの放射線遮へい評価

津田 啓介; 福士 政広*; 明上山 温*; 北村 秀秋*; 井上 一雅*; 中谷 儀一郎*; 木村 純一*; 澤口 政人*; 木名瀬 栄   ; 斎藤 公明  

Tsuda, Keisuke; Fukushi, Masahiro*; Myojoyama, Atsushi*; Kitamura, Hideaki*; Inoue, Kazumasa*; Nakaya, Giichiro*; Kimura, Junichi*; Sawaguchi, Masato*; Kinase, Sakae; Saito, Kimiaki

近年、核医学診断では、陽電子放射断層撮影(PET)検査が広く利用され、クリニカルPETとして普及している。ポジトロン放出核種の実効線量定数は、核医学診断で広く使用されている核種$$^{99m}$$Tcの約8倍であるため、今後のポジトロン核種を用いる検査の発展には、十分な防護がなされなければならない。このため、PET施設における放射線防護,安全確保が課題であり、PET施設の放射線遮へい材として含鉛ガラスに注目が集まっている。われわれは、英国ピルキントン社製の2種類の含鉛ガラスの放射線遮へい能評価の依頼を受け、本研究において、含鉛ガラスの$$^{18}$$F(511keV)に対する放射線遮へい能評価を、実測及びモンテカルロシミュレーション計算評価にて行った。本研究の結果、実測値とモンテカルロシミュレーション値との実効線量透過率を算出し、今回評価した含鉛ガラスには十分な防護効果があることを確認した。さらに、$$^{137}$$Cs(662keV), $$^{60}$$Co(1.17, 1.33MeV)に対する遮へい能評価を行い、同様の防護効果があることを確認した。

Positron emission tomography (PET) is very effective in the diagnosis and management of patients with various types of cancers. PET scanning with the tracer FDG is widely used in clinical PET. However, the effective dose constant of the positron emitter is about eight times of nuclide $$^{99m}$$Tc used in a nuclear medicine diagnosis widely. Severe radiation protection is necessary for development of the examination with a positron emitter. Radiation protection in the PET institution therefore and safe security are problems. Hence, lead glass has attracted considerable attention as the radiation shielding materials of the PET institution. In the present study, we received a request of the radiation shielding ability evaluation of two kinds of lead glass made in Pilkington plc. The aim of the present work is the radiation shielding ability evaluation for positron emitter such as $$^{18}$$F(511 keV) of the lead glass. The shielding ability evaluation has been studied in the experimental and the Monte Carlo simulation evaluation. Consequently, effective dose transmission factor with experimental and the Monte Carlo simulation value was calculated. There were enough protection effects to evaluated lead glass. Furthermore, radiation shielding ability evaluation for $$^{137}$$Cs(662 keV), $$^{60}$$Co(1.17, 1.33 MeV) was performed, and it was shown that there was a similar protection effect.

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