東京都立産業技術研究センターTokyo Metropolitan Industrial Technology Research Institute
低エネルギー電子線を用いて生卵の卵殻のみを殺菌し可食部の線量を我が国で食品に認められる照射限度値（0.10 Gy）以下にするための照射条件を，線量計測実験とモンテカルロシミュレーションで評価した。その結果，卵殻の深度線量分布の評価から加速電圧80–200 kVの照射条件が有効であった。可食部の線量は，80–150 kVの電子線照射で0.10 Gy以下となった。また，電子線のエネルギーが低い程，制動X線の寄与は少なく可食部の線量も減少した。
When controlling food production or processing, irradiation of 0.10 Gy or less to food is permitted in Japan. We examined the dose absorbed in at the edible part when sterilizing shell eggs with low energy electron beam. Irradiation conditions with electron beam were evaluated by experiments and Monte Carlo simulation. The depth dose distribution of electron beam for eggshell indicated that the accleration voltages from 80 kV to 200 kV were optimal for eggshell sterilization. Then, it was found that accleration voltages from 80 kV to 150 kV were appropriate to reduce the dose of the edible part of egg in less than or equal to 0.10 Gy. And, contribution of bremsstrahlung for the edible part of egg decreased as the energy of electron beam was lowered.
Key words: sterilization; low energy electron beam; egg; eggshell; bremsstrahlung; Monte Carlo simulation
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