[{"data":1,"prerenderedAt":198},["ShallowReactive",2],{"topic-page:\u002Fhigh-school\u002Fbasic-physics\u002Felectricity\u002Fradiation-and-nuclear-energy":3},{"topic":4,"category":161,"seo":166,"breadcrumbs":171,"prerequisites":178,"nextTopics":188,"relatedTopics":197},{"id":5,"slug":6,"title":7,"summary":8,"canonicalPath":9,"categoryPath":10,"difficulty":11,"targetAudience":12,"estimatedMinutes":13,"generatedAt":14,"publishedAt":14,"updatedAt":14,"reviewStatus":15,"tags":16,"expectedKnowledge":22,"learningGoal":25,"blocks":26},"high-school-basic-physics-electricity-radiation-and-nuclear-energy","radiation-and-nuclear-energy","放射線と原子力エネルギー","放射線の種類と透過性、Bq・Gy・Svが表す量、半減期を区別し、原子力利用と課題を根拠から整理します。","\u002Fhigh-school\u002Fbasic-physics\u002Felectricity\u002Fradiation-and-nuclear-energy","\u002Fhigh-school\u002Fbasic-physics\u002Felectricity","beginner","student_high",6,"2026-07-28","ai_generated",[17,18,19,20,21],"物理基礎","放射線","原子力","半減期","単位",[23,24],"エネルギー変換","指数的な変化の読み方","代表的な放射線の性質、放射能・吸収線量・人体影響を考慮した線量の違い、半減期、原子力利用と課題を区別して説明できるようになる。",[27,32,44,67,87,93,102,108,114,130,141,150],{"id":28,"type":29,"title":7,"subtitle":30,"shortDefinition":31},"hero","HeroBlock","種類・測る量・時間変化を分ける","放射線は種類によって物質との関わり方や透過性が異なります。さらにBq、Gy、Svは同じ量の別名ではありません。まず「何が出るか」「何を測るか」「時間とともにどう変わるか」を分けます。",{"id":33,"type":34,"term":35,"definition":36,"plainExplanation":37,"keywords":38},"definition","DefinitionBlock","放射線と放射能","放射線は原子核などから放出され物質へ作用する粒子や電磁波で、放射能は放射性物質が放射線を出す性質です。","α線はヘリウム原子核、β線は主に高速の電子、γ線は電磁波です。中性子線は中性子からなります。原子力発電では、重い原子核の核分裂で放出される原子核エネルギーを熱へ移し、蒸気でタービンと発電機を回して電気へ変換します。放射線の種類が違えば電荷、質量、透過性、遮へいとの関わりも異なります。",[39,40,41,42,43],"α線","β線","γ線","中性子線","放射能",{"id":45,"type":46,"title":47,"formulas":48,"strategy":66},"formula","FormulaBlock","半減期ごとの残り方",[49],{"label":50,"expression":51,"meaning":52,"symbols":53,"tip":65},"半減期をn回経た後","N=N₀×(1\u002F2)ⁿ,  n=t÷T","放射性核種の数や放射能は、半減期を一回経るごとにその時点の半分になります。",[54,57,60,62],{"symbol":55,"meaning":56},"N₀","初めの核種の数または放射能",{"symbol":58,"meaning":59},"N","時間t後の核種の数または放射能",{"symbol":61,"meaning":20},"T",{"symbol":63,"meaning":64},"n","経過した半減期の回数","半減期が同じ単位で何回入るかを先に求めます。半減期後に突然0にはなりません。","時間を半減期で割り、残る割合を1\u002F2、1\u002F4、1\u002F8…と段階的に追います。",{"id":68,"type":69,"columns":70,"rows":73,"summary":86},"compare","CompareBlock",[21,71,72],"測る量","読み方の要点",[74,78,82],[75,76,77],"Bq","1秒当たりの壊変数","放射性物質側の活動",[79,80,81],"Gy","物質1 kgが吸収したエネルギー","吸収線量、1 Gy=1 J\u002Fkg",[83,84,85],"Sv","放射線の種類や人体影響を考慮した線量","防護上の評価に用いる量","測る対象が異なるため、Bqの数値から条件なしにGyやSvへ単純換算することはできません。",{"id":88,"type":89,"src":90,"alt":91,"caption":92},"diagram","DiagramBlock","\u002Fassets\u002Fhigh-school\u002Fbasic-physics\u002Felectricity\u002Fradiation-and-nuclear-energy\u002Fradiation-and-nuclear-energy.svg","核分裂から熱・回転・電気への変換経路、α線・β線・γ線・中性子線の代表的透過性、Bq・Gy・Svが測る量を三段で分けた図","上段は核分裂から熱・回転・電気への変換経路、中段は種類ごとの代表的透過性、下段はBq・Gy・Svが測る対象を、配置・線種・文字で分けます。",{"id":94,"type":95,"steps":96,"title":101},"steps","StepBlock",[97,98,99,100],"α・β・γ・中性子線のどれかを確認する","放射性物質、吸収する物質、人体影響のどの量かを分ける","半減期なら経過時間に何回含まれるかを数える","利用と課題は目的、便益、安全確保、廃棄物などの条件を分ける","放射線の設問を読む手順",{"id":103,"type":104,"scenario":105,"explanation":106,"result":107},"example","ExampleBlock","半減期8日の放射性核種がある。初めの核種数に対し、24日後に残る割合を求める。","24\u002F8=3なので半減期を3回経ています。残る割合は(1\u002F2)×(1\u002F2)×(1\u002F2)=1\u002F8です。0日→8日で1\u002F2、16日で1\u002F4、24日で1\u002F8と段階を追えます。","24日後に残る割合は1\u002F8です。",{"id":109,"type":110,"warningTitle":111,"message":112,"severity":109,"action":113},"warning","WarningBlock","三つの単位を数値だけで結ばない","Bqは壊変の頻度、Gyは吸収エネルギー、Svは人体影響を考慮した量です。放射線の種類、距離、遮へい、照射条件などを無視した一対一換算はできません。","単位を見るたびに「何の、どの量か」を言葉で書きます。個別の安全判断は公的機関や専門家の情報に従います。",{"id":115,"type":116,"title":117,"questions":118},"quiz","QuizBlock","半減期の確認",[119],{"question":120,"choices":121,"answerIndex":125,"choiceExplanations":126},"半減期5年の核種について、初めの量の1\u002F4になるのは何年後ですか。",[122,123,124],"10年後","5年後","20年後",0,[127,128,129],"正解です。5年で1\u002F2、10年で1\u002F4となります。","半減期1回では1\u002F2で、まだ1\u002F4ではありません。","半減期4回では1\u002F16まで減ります。",{"id":131,"type":116,"title":132,"questions":133},"quiz-units","単位の確認",[134],{"question":135,"choices":136,"answerIndex":125,"choiceExplanations":137},"放射性物質で1秒間に起こる壊変の数を表す単位はどれですか。",[75,79,83],[138,139,140],"正解です。1 Bqは1秒当たり1回の壊変です。","Gyは物質1 kgが吸収したエネルギーを表す吸収線量の単位です。","Svは放射線の種類や人体影響を考慮した線量に使われる単位です。",{"id":142,"type":143,"title":144,"points":145},"summary","SummaryBlock","まとめ",[146,147,148,149],"放射線は種類により物質との関わりと透過性が異なる","Bq・Gy・Svは測る量が異なる","半減期ごとにその時点の半分となる","原子力利用は目的・便益・安全確保・課題を分けて考える",{"id":151,"type":152,"title":153,"nextTopics":154,"relatedKeywords":156},"next-action","NextActionBlock","学んだ法則を技術の機能へ結び付ける",[155],"high-school-basic-physics-electricity-physics-in-everyday-technology",[157,158,159,160],"技術","測定","モデル","社会",{"path":10,"title":162,"description":163,"parentPath":164,"accentToken":165},"電気","物理基礎の中でも、電流、電圧、回路の基本を扱うトピックを整理していくカテゴリです。","\u002Fhigh-school\u002Fbasic-physics","signal-blue",{"title":167,"description":168,"canonicalUrl":169,"ogImage":170},"放射線・半減期と原子力エネルギー | 物理基礎","α線・β線・γ線・中性子線、Bq・Gy・Sv、半減期、核分裂の利用と課題を区別して学びます。","https:\u002F\u002Fzeqnilo.com\u002Fhigh-school\u002Fbasic-physics\u002Felectricity\u002Fradiation-and-nuclear-energy","https:\u002F\u002Fzeqnilo.com\u002Fassets\u002Fsite\u002Fdefault-og.svg",[172,175,176,177],{"title":173,"path":174},"高校","\u002Fhigh-school",{"title":17,"path":164},{"title":162,"path":10},{"title":7,"path":9},[179],{"id":180,"title":181,"summary":182,"canonicalPath":183,"categoryPath":10,"categoryTitle":162,"difficulty":11,"targetAudience":12,"estimatedMinutes":13,"publishedAt":14,"updatedAt":14,"reviewStatus":15,"tags":184},"high-school-basic-physics-electricity-energy-resources-and-electricity-generation","エネルギー資源と発電","水力、火力、原子力、太陽光、風力をエネルギー変換の鎖として捉え、効率と複数の評価軸で比較します。","\u002Fhigh-school\u002Fbasic-physics\u002Felectricity\u002Fenergy-resources-and-electricity-generation",[17,162,185,186,187],"エネルギー資源","発電","変換効率",[189],{"id":155,"title":190,"summary":191,"canonicalPath":192,"categoryPath":10,"categoryTitle":162,"difficulty":11,"targetAudience":12,"estimatedMinutes":13,"publishedAt":14,"updatedAt":14,"reviewStatus":15,"tags":193},"物理学が支える身近な技術","交通、計測、情報通信、建築などの技術を、現象・法則・機能・限界の順に物理基礎へ結び付けます。","\u002Fhigh-school\u002Fbasic-physics\u002Felectricity\u002Fphysics-in-everyday-technology",[17,194,195,196,158],"科学技術","超音波","通信",[],1785565318326]