放射性同位体とその半減期 - YAML

- code: "001"
  slug: "tellurium-128"
  name: "テルル-128"
  symbol: "Te-128"
  atomicNumber: 52
  massNumber: 128
  halfLife:
    value: 2.2
    unit: "×10²⁴ years"
    seconds: 6.94e+31
  decayMode: "double beta decay"
  category: "naturally-occurring"
  description: "現在知られている中で最も長い半減期を持つ放射性同位体です。"
- code: "002"
  slug: "xenon-136"
  name: "キセノン-136"
  symbol: "Xe-136"
  atomicNumber: 54
  massNumber: 136
  halfLife:
    value: 2.38
    unit: "×10²¹ years"
    seconds: 7.51e+28
  decayMode: "double beta decay"
  category: "naturally-occurring"
  description: "二重ベータ崩壊を起こす希ガス元素の同位体です。"
- code: "003"
  slug: "thorium-232"
  name: "トリウム-232"
  symbol: "Th-232"
  atomicNumber: 90
  massNumber: 232
  halfLife:
    value: 1.41
    unit: "×10¹⁰ years"
    seconds: 445000000000000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "トリウム系列の親核種であり、地球に豊富に存在する放射性元素です。"
- code: "004"
  slug: "uranium-238"
  name: "ウラン-238"
  symbol: "U-238"
  atomicNumber: 92
  massNumber: 238
  halfLife:
    value: 4.47
    unit: "×10⁹ years"
    seconds: 141000000000000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "天然ウランの主要構成成分であり、ウラン系列の親核種です。"
- code: "005"
  slug: "potassium-40"
  name: "カリウム-40"
  symbol: "K-40"
  atomicNumber: 19
  massNumber: 40
  halfLife:
    value: 1.26
    unit: "×10⁹ years"
    seconds: 39800000000000000
  decayMode: "beta decay / electron capture"
  category: "naturally-occurring"
  description: "カリウムの放射性同位体で、岩石年代測定に広く利用されます。"
- code: "006"
  slug: "uranium-235"
  name: "ウラン-235"
  symbol: "U-235"
  atomicNumber: 92
  massNumber: 235
  halfLife:
    value: 7.04
    unit: "×10⁸ years"
    seconds: 22200000000000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "核分裂性を持ち、原子力発電の主要燃料です。"
- code: "007"
  slug: "plutonium-244"
  name: "プルトニウム-244"
  symbol: "Pu-244"
  atomicNumber: 94
  massNumber: 244
  halfLife:
    value: 8.26
    unit: "×10⁷ years"
    seconds: 2610000000000000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "最も長い半減期を持つプルトニウムの同位体です。"
- code: "008"
  slug: "iodine-129"
  name: "ヨウ素-129"
  symbol: "I-129"
  atomicNumber: 53
  massNumber: 129
  halfLife:
    value: 1.57
    unit: "×10⁷ years"
    seconds: 495000000000000
  decayMode: "beta decay"
  category: "fission-product"
  description: "長寿命核分裂生成物で、地質学的年代測定に利用されます。"
- code: "009"
  slug: "aluminum-26"
  name: "アルミニウム-26"
  symbol: "Al-26"
  atomicNumber: 13
  massNumber: 26
  halfLife:
    value: 7.17
    unit: "×10⁵ years"
    seconds: 22600000000000
  decayMode: "beta decay / electron capture"
  category: "cosmogenic"
  description: "宇宙線によって生成され、隕石年代測定に利用されます。"
- code: "010"
  slug: "carbon-14"
  name: "炭素-14"
  symbol: "C-14"
  atomicNumber: 6
  massNumber: 14
  halfLife:
    value: 5730
    unit: "years"
    seconds: 181000000000
  decayMode: "beta decay"
  category: "cosmogenic"
  description: "放射性炭素年代測定法の基礎となる最も有名な同位体です。"
- code: "011"
  slug: "plutonium-239"
  name: "プルトニウム-239"
  symbol: "Pu-239"
  atomicNumber: 94
  massNumber: 239
  halfLife:
    value: 24100
    unit: "years"
    seconds: 761000000000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "核分裂性を持ち、原子力発電と核兵器の両方に使用されます。"
- code: "012"
  slug: "americium-241"
  name: "アメリシウム-241"
  symbol: "Am-241"
  atomicNumber: 95
  massNumber: 241
  halfLife:
    value: 432.2
    unit: "years"
    seconds: 13600000000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "煙感知器に広く使用される人工放射性元素です。"
- code: "013"
  slug: "radium-226"
  name: "ラジウム-226"
  symbol: "Ra-226"
  atomicNumber: 88
  massNumber: 226
  halfLife:
    value: 1600
    unit: "years"
    seconds: 50500000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "キュリー夫人によって発見され、かつて医療に使用された有名な放射性元素です。"
- code: "014"
  slug: "cesium-137"
  name: "セシウム-137"
  symbol: "Cs-137"
  atomicNumber: 55
  massNumber: 137
  halfLife:
    value: 30.17
    unit: "years"
    seconds: 952000000
  decayMode: "beta decay"
  category: "fission-product"
  description: "核分裂生成物で、医療と工業に利用されると同時に環境汚染の懸念もあります。"
- code: "015"
  slug: "strontium-90"
  name: "ストロンチウム-90"
  symbol: "Sr-90"
  atomicNumber: 38
  massNumber: 90
  halfLife:
    value: 28.8
    unit: "years"
    seconds: 909000000
  decayMode: "beta decay"
  category: "fission-product"
  description: "骨に取り込まれやすい核分裂生成物で、環境モニタリングの重要対象です。"
- code: "016"
  slug: "tritium"
  name: "トリチウム（三重水素）"
  symbol: "H-3"
  atomicNumber: 1
  massNumber: 3
  halfLife:
    value: 12.3
    unit: "years"
    seconds: 388000000
  decayMode: "beta decay"
  category: "cosmogenic"
  description: "水素の放射性同位体で、核融合研究や時計の発光塗料に使用されます。"
- code: "017"
  slug: "cobalt-60"
  name: "コバルト-60"
  symbol: "Co-60"
  atomicNumber: 27
  massNumber: 60
  halfLife:
    value: 5.27
    unit: "years"
    seconds: 166000000
  decayMode: "beta decay"
  category: "artificial"
  description: "がん治療用の放射線源として広く使用される人工放射性同位体です。"
- code: "018"
  slug: "iridium-192"
  name: "イリジウム-192"
  symbol: "Ir-192"
  atomicNumber: 77
  massNumber: 192
  halfLife:
    value: 73.8
    unit: "days"
    seconds: 6380000
  decayMode: "beta decay"
  category: "artificial"
  description: "工業用放射線透過試験に広く使用されるガンマ線源です。"
- code: "019"
  slug: "iodine-131"
  name: "ヨウ素-131"
  symbol: "I-131"
  atomicNumber: 53
  massNumber: 131
  halfLife:
    value: 8.04
    unit: "days"
    seconds: 695000
  decayMode: "beta decay"
  category: "fission-product"
  description: "甲状腺の診断と治療に使用される核医学用放射性同位体です。"
- code: "020"
  slug: "molybdenum-99"
  name: "モリブデン-99"
  symbol: "Mo-99"
  atomicNumber: 42
  massNumber: 99
  halfLife:
    value: 65.9
    unit: "hours"
    seconds: 237000
  decayMode: "beta decay"
  category: "fission-product"
  description: "テクネチウム-99mの親核種であり、核医学診断の基盤となります。"
- code: "021"
  slug: "technetium-99m"
  name: "テクネチウム-99m"
  symbol: "Tc-99m"
  atomicNumber: 43
  massNumber: 99
  halfLife:
    value: 6.01
    unit: "hours"
    seconds: 21600
  decayMode: "isomeric transition"
  category: "artificial"
  description: "核医学診断で最も広く使用される放射性同位体です。"
- code: "022"
  slug: "fluorine-18"
  name: "フッ素-18"
  symbol: "F-18"
  atomicNumber: 9
  massNumber: 18
  halfLife:
    value: 109.8
    unit: "minutes"
    seconds: 6588
  decayMode: "positron emission"
  category: "artificial"
  description: "PET検査で使用される陽電子放出核種です。"
- code: "023"
  slug: "radon-222"
  name: "ラドン-222"
  symbol: "Rn-222"
  atomicNumber: 86
  massNumber: 222
  halfLife:
    value: 3.82
    unit: "days"
    seconds: 330000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "室内空気汚染の原因となる自然発生の放射性ガスです。"
- code: "024"
  slug: "polonium-210"
  name: "ポロニウム-210"
  symbol: "Po-210"
  atomicNumber: 84
  massNumber: 210
  halfLife:
    value: 138.4
    unit: "days"
    seconds: 12000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "強いアルファ線を放出し、かつては静電気除去装置に使用されました。"
- code: "025"
  slug: "bismuth-213"
  name: "ビスマス-213"
  symbol: "Bi-213"
  atomicNumber: 83
  massNumber: 213
  halfLife:
    value: 45.6
    unit: "minutes"
    seconds: 2736
  decayMode: "beta decay / alpha decay"
  category: "artificial"
  description: "標的放射性核種治療に使用されるアルファ線源です。"
- code: "026"
  slug: "actinium-225"
  name: "アクチニウム-225"
  symbol: "Ac-225"
  atomicNumber: 89
  massNumber: 225
  halfLife:
    value: 9.9
    unit: "days"
    seconds: 855000
  decayMode: "alpha decay"
  category: "artificial"
  description: "標的アルファ治療に使用される有望な放射性同位体です。"
- code: "027"
  slug: "lutetium-177"
  name: "ルテチウム-177"
  symbol: "Lu-177"
  atomicNumber: 71
  massNumber: 177
  halfLife:
    value: 6.65
    unit: "days"
    seconds: 575000
  decayMode: "beta decay"
  category: "artificial"
  description: "神経内分泌腫瘍の治療に使用されるベータ線源です。"
- code: "028"
  slug: "yttrium-90"
  name: "イットリウム-90"
  symbol: "Y-90"
  atomicNumber: 39
  massNumber: 90
  halfLife:
    value: 64.1
    unit: "hours"
    seconds: 231000
  decayMode: "beta decay"
  category: "fission-product"
  description: "肝がん治療（SIRT）に使用されるベータ線源です。"
- code: "029"
  slug: "phosphorus-32"
  name: "リン-32"
  symbol: "P-32"
  atomicNumber: 15
  massNumber: 32
  halfLife:
    value: 14.3
    unit: "days"
    seconds: 1240000
  decayMode: "beta decay"
  category: "artificial"
  description: "悪性腫瘍の治療と生物学研究に使用されます。"
- code: "030"
  slug: "sodium-24"
  name: "ナトリウム-24"
  symbol: "Na-24"
  atomicNumber: 11
  massNumber: 24
  halfLife:
    value: 15
    unit: "hours"
    seconds: 54000
  decayMode: "beta decay"
  category: "artificial"
  description: "血流測定や工業用流量測定に使用されます。"
- code: "031"
  slug: "gallium-68"
  name: "ガリウム-68"
  symbol: "Ga-68"
  atomicNumber: 31
  massNumber: 68
  halfLife:
    value: 68
    unit: "minutes"
    seconds: 4080
  decayMode: "positron emission"
  category: "artificial"
  description: "PET検査で使用される陽電子放出核種です。"
- code: "032"
  slug: "copper-64"
  name: "銅-64"
  symbol: "Cu-64"
  atomicNumber: 29
  massNumber: 64
  halfLife:
    value: 12.7
    unit: "hours"
    seconds: 45720
  decayMode: "beta decay / positron emission / electron capture"
  category: "artificial"
  description: "PET画像診断と放射性核種治療の両方に使用される多目的核種です。"
- code: "033"
  slug: "astatine-211"
  name: "アスタチン-211"
  symbol: "At-211"
  atomicNumber: 85
  massNumber: 211
  halfLife:
    value: 7.2
    unit: "hours"
    seconds: 25920
  decayMode: "alpha decay / electron capture"
  category: "artificial"
  description: "標的アルファ治療に使用される希少なハロゲン元素です。"
- code: "034"
  slug: "lead-212"
  name: "鉛-212"
  symbol: "Pb-212"
  atomicNumber: 82
  massNumber: 212
  halfLife:
    value: 10.6
    unit: "hours"
    seconds: 38160
  decayMode: "beta decay"
  category: "naturally-occurring"
  description: "トロウ系列の中間核種で、標的放射性核種治療に使用されます。"
- code: "035"
  slug: "thorium-229"
  name: "トリウム-229"
  symbol: "Th-229"
  atomicNumber: 90
  massNumber: 229
  halfLife:
    value: 7340
    unit: "years"
    seconds: 232000000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "核時計の研究に使用されるトリウムの同位体です。"
- code: "036"
  slug: "protactinium-231"
  name: "プロトアクチニウム-231"
  symbol: "Pa-231"
  atomicNumber: 91
  massNumber: 231
  halfLife:
    value: 32760
    unit: "years"
    seconds: 1030000000000
  decayMode: "alpha decay"
  category: "naturally-occurring"
  description: "海洋循環の年代測定に使用される長寿命放射性核種です。"
- code: "037"
  slug: "neptunium-237"
  name: "ネプツニウム-237"
  symbol: "Np-237"
  atomicNumber: 93
  massNumber: 237
  halfLife:
    value: 2.14
    unit: "×10⁶ years"
    seconds: 67500000000000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "ネプツニウム系列の親核種であり、使用済み核燃料中に存在します。"
- code: "038"
  slug: "curium-247"
  name: "キュリウム-247"
  symbol: "Cm-247"
  atomicNumber: 96
  massNumber: 247
  halfLife:
    value: 1.56
    unit: "×10⁷ years"
    seconds: 492000000000000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "最も長い半減期を持つキュリウムの同位体です。"
- code: "039"
  slug: "einsteinium-252"
  name: "アインスタイニウム-252"
  symbol: "Es-252"
  atomicNumber: 99
  massNumber: 252
  halfLife:
    value: 471.7
    unit: "days"
    seconds: 40800000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "最も長い半減期を持つアインスタイニウムの同位体です。"
- code: "040"
  slug: "californium-251"
  name: "カリホルニウム-251"
  symbol: "Cf-251"
  atomicNumber: 98
  massNumber: 251
  halfLife:
    value: 898
    unit: "years"
    seconds: 28300000000
  decayMode: "alpha decay"
  category: "transuranic"
  description: "最も長い半減期を持つカリホルニウムの同位体です。"