With the recent dissemination of mobile communications devices, cases have frequency arisen in which explosives are exposed to electromagnetic radiation. On the other hand, there is also a move afoot to actively utilize mobile communication techniques at locations where explosives are handled. However, not only have no definite controls been established over the handling of explosives in an electromagnetic radiation environment but there are only a few guidelines that reflect the current state of affairs. We directly applied the radio-frequency energy radiated by such a communications device to an electric detonator through a cable and observed its behavior. As a result, it has been verified that the ignition sensitivity of an electric detonator for radio-frequency energy is greatly affected by its load characteristics. Since the ignition sensitivity of an electric detonator for radio-frequency is dependent on the current flowing in it, we formulated a model for the radio-frequency energy propagation circuit system and estimated the current value. As a result, it has been concluded that when the output impedance of the signal source is 50 W, a hazardous condition might occur if the output power is 0.8 W or more.
近年の移動体通信機器の普及により, 火薬類が電磁波環境に晒される機会が多くなっている｡ また一方では, 火薬を取り扱う現場において移動体通信技術を積極的に利用する動きもある｡ しかしながら, 電磁波に対する火薬類の取扱いに関する明確な規制はなく, また実態に則した指針は少ない｡
今回, これら通信機器が放射する高周波エネルギーを有線によって直接電気雷管に入力してその挙動を確認した｡
その結果, 高周波エネルギーに対する電気雷管の発火感度は, その負荷特性が大きく影響することを確認した｡
また, 高周波エネルギーによっても, 電気雷管の発火感度は電気雷管に流れる電流に依存するので, 高周波エネルギー伝搬回路系をモデル化して, 電流値を推定した｡ その結果, 信号源の出力インピーダンスが50 Ω の場合において, 出力電力が0.8 W 以上の場合は危険性が高いと推定された｡