<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Irradiation vs. Contamination</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 8px 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .header {
      text-align: center;
    }
    .title {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
    }
    .panels-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
    }
    @media (max-width: 480px) {
      .panels-grid {
        grid-template-columns: 1fr;
        gap: 8px;
      }
    }
    .panel-card {
      background: #f8fafc;
      border-radius: 10px;
      padding: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }
    .panel-title {
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 2px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .badge {
      font-size: 10.5px;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 999px;
      margin-bottom: 4px;
    }
    .badge-blue {
      background: #e0f2fe;
      color: #0369a1;
    }
    .badge-amber {
      background: #fef3c7;
      color: #b45309;
    }
    .scene-svg {
      width: 100%;
      max-width: 260px;
      height: auto;
      display: block;
    }
    .caption-box {
      margin-top: 6px;
      padding: 6px 8px;
      border-radius: 6px;
      font-size: 11.5px;
      line-height: 1.35;
      text-align: center;
      width: 100%;
    }
    .caption-irr {
      background: #f1f5f9;
      color: #334155;
    }
    .caption-con {
      background: #fffbeb;
      color: #92400e;
    }
    .caption-box strong {
      display: block;
      font-size: 11.5px;
      margin-top: 2px;
    }

    /* Wave animations */
    @keyframes wavePass {
      0% { stroke-dashoffset: 60; opacity: 0.2; }
      50% { opacity: 1; }
      100% { stroke-dashoffset: 0; opacity: 0.2; }
    }
    .wave-line {
      stroke: #8b5cf6;
      stroke-width: 2.5;
      stroke-linecap: round;
      fill: none;
      stroke-dasharray: 8, 4;
      animation: wavePass 2s linear infinite;
    }

    .emit-ray {
      stroke: #f59e0b;
      stroke-width: 2;
      stroke-linecap: round;
      opacity: 0.85;
      animation: rayBlink 1.5s ease-in-out infinite alternate;
    }
    @keyframes rayBlink {
      0% { opacity: 0.3; stroke-width: 1.5; }
      100% { opacity: 1; stroke-width: 2.5; }
    }
    .dust-particle {
      fill: #f59e0b;
      stroke: #d97706;
      stroke-width: 1;
    }
    .particle-pulse {
      animation: glowParticle 1.8s ease-in-out infinite alternate;
    }
    @keyframes glowParticle {
      0% { filter: drop-shadow(0 0 1px #f59e0b); }
      100% { filter: drop-shadow(0 0 4px #d97706); }
    }
  </style>
</head>
<body>

  <div class="header">
    <div class="title">Irradiation vs. Contamination</div>
  </div>

  <div class="panels-grid">
    
    <div class="panel-card">
      <div class="panel-title">Irradiation</div>
      <div class="badge badge-blue">External Exposure</div>

      <svg class="scene-svg" viewBox="0 0 240 175" aria-label="Diagram showing irradiation process">
        <defs>
          <linearGradient id="rockGrad" x1="0" y1="0" x2="1" y2="1">
            <stop offset="0%" stop-color="#a855f7" />
            <stop offset="100%" stop-color="#6b21a8" />
          </linearGradient>
        </defs>

        
        <g transform="translate(165, 14)">
          <rect x="-46" y="-10" width="92" height="20" rx="10" fill="#10b981" />
          <text x="0" y="3.5" font-size="9" text-anchor="middle" fill="#ffffff" font-weight="700" letter-spacing="0.3">NOT RADIOACTIVE</text>
        </g>

        
        <rect x="15" y="75" width="46" height="55" rx="4" fill="#e2e8f0" stroke="#94a3b8" stroke-width="2" />
        <rect x="20" y="80" width="36" height="45" rx="2" fill="#ede9fe" stroke="#c4b5fd" stroke-width="1.5" />
        
        <polygon points="28,115 35,90 48,94 52,115 40,120" fill="url(#rockGrad)" />
        
        <text x="38" y="110" font-size="14" text-anchor="middle" fill="#facc15">☢</text>
        <text x="38" y="142" font-size="9" text-anchor="middle" fill="#64748b" font-weight="600">Source</text>

        
        <path class="wave-line" d="M 58 88 Q 95 82 130 88 T 205 88" />
        <path class="wave-line" d="M 58 102 Q 95 96 130 102 T 205 102" style="animation-delay: -0.5s;" />
        <path class="wave-line" d="M 58 116 Q 95 110 130 116 T 205 116" style="animation-delay: -1s;" />

        
        
        <circle cx="165" cy="48" r="14" fill="#cbd5e1" stroke="#475569" stroke-width="2" />
        
        <rect x="153" y="64" width="24" height="48" rx="8" fill="#e2e8f0" stroke="#475569" stroke-width="2" />
        
        <line x1="151" y1="70" x2="140" y2="103" stroke="#475569" stroke-width="4" stroke-linecap="round" />
        <line x1="179" y1="70" x2="190" y2="103" stroke="#475569" stroke-width="4" stroke-linecap="round" />
        
        <line x1="159" y1="112" x2="157" y2="158" stroke="#475569" stroke-width="4" stroke-linecap="round" />
        <line x1="171" y1="112" x2="173" y2="158" stroke="#475569" stroke-width="4" stroke-linecap="round" />
      </svg>

      <div class="caption-box caption-irr">
        Exposed to radiation from outside.<br>
        <strong>Figure is NOT radioactive.</strong>
      </div>
    </div>

    
    <div class="panel-card">
      <div class="panel-title">Contamination</div>
      <div class="badge badge-amber">Internal &amp; Surface Atoms</div>

      <svg class="scene-svg" viewBox="0 0 240 175" aria-label="Diagram showing contamination process">
        
        <g transform="translate(120, 14)">
          <rect x="-46" y="-10" width="92" height="20" rx="10" fill="#d97706" />
          <text x="0" y="3.5" font-size="9" text-anchor="middle" fill="#ffffff" font-weight="700" letter-spacing="0.3">EMITS RADIATION</text>
        </g>

        
        <line class="emit-ray" x1="110" y1="44" x2="90" y2="36" />
        <line class="emit-ray" x1="130" y1="44" x2="150" y2="36" />
        <line class="emit-ray" x1="98" y1="78" x2="76" y2="73" />
        <line class="emit-ray" x1="142" y1="78" x2="164" y2="73" />
        <line class="emit-ray" x1="96" y1="100" x2="74" y2="106" />
        <line class="emit-ray" x1="144" y1="100" x2="166" y2="106" />
        <line class="emit-ray" x1="106" y1="138" x2="88" y2="150" />
        <line class="emit-ray" x1="134" y1="138" x2="152" y2="150" />

        
        
        <circle cx="120" cy="48" r="14" fill="#fed7aa" stroke="#c2410c" stroke-width="2" />
        
        <rect x="108" y="64" width="24" height="48" rx="8" fill="#ffedd5" stroke="#c2410c" stroke-width="2" />
        
        <ellipse cx="115" cy="80" rx="3.5" ry="5.5" fill="#fdba74" opacity="0.8" />
        <ellipse cx="125" cy="80" rx="3.5" ry="5.5" fill="#fdba74" opacity="0.8" />
        
        <line x1="106" y1="70" x2="95" y2="103" stroke="#c2410c" stroke-width="4" stroke-linecap="round" />
        <line x1="134" y1="70" x2="145" y2="103" stroke="#c2410c" stroke-width="4" stroke-linecap="round" />
        
        <line x1="114" y1="112" x2="112" y2="158" stroke="#c2410c" stroke-width="4" stroke-linecap="round" />
        <line x1="126" y1="112" x2="128" y2="158" stroke="#c2410c" stroke-width="4" stroke-linecap="round" />

        
        <g class="particle-pulse">
          
          <circle class="dust-particle" cx="116" cy="42" r="2.5" />
          <circle class="dust-particle" cx="125" cy="50" r="2" />
          
          <circle class="dust-particle" cx="115" cy="80" r="2.5" />
          <circle class="dust-particle" cx="125" cy="81" r="2.5" />
          
          <circle class="dust-particle" cx="109" cy="72" r="2" />
          <circle class="dust-particle" cx="128" cy="93" r="2.5" />
          <circle class="dust-particle" cx="98" cy="96" r="2" />
          <circle class="dust-particle" cx="142" cy="90" r="2" />
          <circle class="dust-particle" cx="113" cy="128" r="2" />
        </g>
      </svg>

      <div class="caption-box caption-con">
        Radioactive atoms are ON and INSIDE the body.<br>
        <strong>Figure emits radiation.</strong>
      </div>
    </div>
  </div>

</body>
</html>

Distinguishing Between Radioactive Contamination and Irradiation

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .matrix-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 640px;
    }

    .column {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .col-irradiation {
      border-top: 4px solid #0284c7;
    }

    .col-contamination {
      border-top: 4px solid #ea580c;
    }

    .col-header {
      text-align: center;
      padding-bottom: 6px;
      border-bottom: 1px solid #f1f5f9;
    }

    .col-title {
      font-size: 15px;
      font-weight: 700;
      letter-spacing: -0.01em;
    }

    .col-irradiation .col-title {
      color: #0284c7;
    }

    .col-contamination .col-title {
      color: #ea580c;
    }

    .protocol-list {
      display: flex;
      flex-direction: column;
      gap: 6px;
      flex-grow: 1;
    }

    .protocol-item {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 8px 10px;
      background: #f8fafc;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      border: 1px solid #eef2f6;
    }

    .icon-box {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      border-radius: 6px;
      flex-shrink: 0;
    }

    .col-irradiation .icon-box {
      background: #e0f2fe;
    }

    .col-contamination .icon-box {
      background: #ffedd5;
    }

    .caption-box {
      margin-top: 4px;
      padding: 8px 10px;
      border-radius: 8px;
      font-size: 12px;
      font-weight: 600;
      text-align: center;
      line-height: 1.3;
    }

    .col-irradiation .caption-box {
      background: #f0f9ff;
      color: #0369a1;
      border: 1px dashed #bae6fd;
    }

    .col-contamination .caption-box {
      background: #fff7ed;
      color: #c2410c;
      border: 1px dashed #fed7aa;
    }

    @media (max-width: 480px) {
      .matrix-grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }
      .protocol-item {
        padding: 6px 8px;
        font-size: 12px;
      }
      .icon-box {
        width: 28px;
        height: 28px;
        font-size: 16px;
      }
      .col-title {
        font-size: 14px;
      }
      .caption-box {
        font-size: 11px;
        padding: 6px 8px;
      }
    }
  </style>
</head>
<body>
  <div class="matrix-grid">
    
    <div class="column col-irradiation">
      <div class="col-header">
        <div class="col-title">Preventing Irradiation</div>
      </div>
      <div class="protocol-list">
        <div class="protocol-item">
          <div class="icon-box">🛡️</div>
          <span>Lead Shielding</span>
        </div>
        <div class="protocol-item">
          <div class="icon-box">📏</div>
          <span>Tongs & Distance</span>
        </div>
        <div class="protocol-item">
          <div class="icon-box">⏱️</div>
          <span>Limited Time</span>
        </div>
      </div>
      <div class="caption-box">
        Block rays & limit time
      </div>
    </div>

    
    <div class="column col-contamination">
      <div class="col-header">
        <div class="col-title">Preventing Contamination</div>
      </div>
      <div class="protocol-list">
        <div class="protocol-item">
          <div class="icon-box">😷</div>
          <span>Respirator Mask</span>
        </div>
        <div class="protocol-item">
          <div class="icon-box">🧤</div>
          <span>Suit & Gloves</span>
        </div>
        <div class="protocol-item">
          <div class="icon-box">🚿</div>
          <span>Wash Station</span>
        </div>
      </div>
      <div class="caption-box">
        Keep atoms off skin & out of lungs
      </div>
    </div>
  </div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Food Irradiation Diagram</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      width: 100%;
      min-height: 100vh;
      padding: 12px 10px;
      user-select: none;
    }

    /* Top Control Bar with responsive wrapping */
    .top-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 10px 14px;
      width: 100%;
      max-width: 580px;
      margin-bottom: 12px;
      padding: 0 4px;
    }
    .status-text {
      font-size: 14px;
      font-weight: 700;
      color: #1e293b;
      line-height: 1.3;
      flex: 1 1 200px;
    }
    .toggle-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #2563eb;
      color: #ffffff;
      border: 1px solid #1d4ed8;
      padding: 7px 15px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
      transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
      flex-shrink: 0;
    }
    .toggle-btn:hover {
      background: #1d4ed8;
      box-shadow: 0 3px 6px rgba(37, 99, 235, 0.3);
    }
    .toggle-btn:focus-visible {
      outline: 2px solid #2563eb;
      outline-offset: 2px;
    }
    .toggle-btn.off {
      background: #475569;
      border-color: #334155;
      box-shadow: 0 2px 4px rgba(71, 85, 105, 0.2);
    }
    .toggle-btn.off:hover {
      background: #334155;
    }
    .btn-dot {
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: #22c55e;
      transition: background 0.2s ease;
    }
    .toggle-btn.off .btn-dot {
      background: #ef4444;
    }

    /* Main Stage */
    .stage {
      position: relative;
      width: 100%;
      max-width: 580px;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Smooth, non-strobing Gamma Wave Animation (2.2s linear cycle) */
    .gamma-ray {
      stroke: #2563eb;
      stroke-width: 2.5;
      fill: none;
      stroke-dasharray: 8 8;
      animation: rayTravel 2.2s linear infinite;
      transition: opacity 0.25s ease;
    }
    @keyframes rayTravel {
      0% { stroke-dashoffset: 32; }
      100% { stroke-dashoffset: 0; }
    }

    .beam-zone {
      fill: rgba(37, 99, 235, 0.08);
      transition: opacity 0.25s ease;
    }

    /* Off States */
    .is-off .gamma-ray {
      opacity: 0;
      animation: none;
    }
    .is-off .beam-zone {
      opacity: 0;
    }
    .is-off .ray-callout {
      opacity: 0.3;
    }
    .is-off .bacteria-dying {
      opacity: 0;
    }
    .is-off .bacteria-idle {
      opacity: 1 !important;
    }

    .bacteria-idle {
      opacity: 0;
      transition: opacity 0.25s ease;
    }

    /* Microbes & labels */
    .microbe {
      font-size: 16px;
    }

    .detector-badge {
      font-weight: 800;
      font-size: 15px;
      fill: #15803d;
    }
    .detector-sub {
      font-size: 12px;
      fill: #1e293b;
      font-weight: 700;
    }
    .label-title {
      font-size: 13px;
      font-weight: 700;
      fill: #0f172a;
    }
    .label-sub {
      font-size: 12px;
      font-weight: 600;
      fill: #475569;
    }
    .phase-pill {
      font-size: 12px;
      font-weight: 800;
      fill: #475569;
    }
    .ray-callout {
      transition: opacity 0.25s ease;
    }
  </style>
</head>
<body>

  
  <div class="top-bar">
    <span class="status-text" id="statusSummary">Cobalt-60 gamma sterilizer active</span>
    <button id="toggleBtn" class="toggle-btn" onclick="toggleSource()" aria-label="Toggle Gamma Source">
      <span class="btn-dot"></span>
      <span id="btnLabel">Turn Source OFF</span>
    </button>
  </div>

  
  <div class="stage" id="stage">
    <svg viewBox="0 0 540 340" aria-label="Gamma Food Irradiation Demonstration">
      <defs>
        
        <linearGradient id="leadGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#64748b"/>
          <stop offset="100%" stop-color="#334155"/>
        </linearGradient>

        
        <linearGradient id="sensorGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#ffffff"/>
          <stop offset="100%" stop-color="#f8fafc"/>
        </linearGradient>

        
        <marker id="rayArrow" viewBox="0 0 8 8" refX="6" refY="4" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
          <path d="M 1 1 L 7 4 L 1 7 z" fill="#2563eb"/>
        </marker>
      </defs>

      
      <g>
        <rect x="25" y="6" width="130" height="22" rx="11" fill="#f1f5f9" stroke="#cbd5e1" stroke-width="1"/>
        <text x="90" y="21" text-anchor="middle" class="phase-pill">1. BEFORE</text>

        <rect x="205" y="6" width="130" height="22" rx="11" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1"/>
        <text x="270" y="21" text-anchor="middle" class="phase-pill" fill="#1e40af" style="fill:#1e40af;">2. IRRADIATION</text>

        <rect x="385" y="6" width="130" height="22" rx="11" fill="#f0fdf4" stroke="#bbf7d0" stroke-width="1"/>
        <text x="450" y="21" text-anchor="middle" class="phase-pill" fill="#166534" style="fill:#166534;">3. AFTER</text>
      </g>

      
      <g transform="translate(30, 252)">
        <rect x="0" y="16" width="480" height="10" rx="5" fill="#94a3b8"/>
        
        <circle cx="25" cy="21" r="8" fill="#475569"/>
        <circle cx="240" cy="21" r="8" fill="#475569"/>
        <circle cx="455" cy="21" r="8" fill="#475569"/>
        <text x="240" y="44" text-anchor="middle" class="label-sub">Conveyor Belt Motion →</text>
      </g>

      
      <polygon id="beamZone" class="beam-zone" points="236,104 304,104 350,252 190,252"/>

      
      
      <text x="270" y="46" text-anchor="middle" class="label-title" fill="#0f172a">Cobalt-60 Source</text>

      <g transform="translate(232, 54)">
        
        <rect x="0" y="0" width="76" height="42" rx="6" fill="url(#leadGrad)" stroke="#1e293b" stroke-width="1.5"/>
        
        <polygon points="22,42 54,42 46,35 30,35" fill="#0f172a"/>
        
        <circle cx="38" cy="19" r="13" fill="#3b82f6"/>
        <circle cx="38" cy="19" r="4.5" fill="#ffffff"/>
        
        <text x="38" y="23" font-size="11" font-weight="900" fill="#0f172a" text-anchor="middle">☢</text>
      </g>

      
      <g id="raysGroup">
        <path class="gamma-ray" d="M 248 102 Q 240 138, 248 176 T 244 252"/>
        <path class="gamma-ray" d="M 262 102 Q 270 138, 262 176 T 268 252"/>
        <path class="gamma-ray" d="M 278 102 Q 270 138, 278 176 T 272 252"/>
        <path class="gamma-ray" d="M 292 102 Q 300 138, 292 176 T 296 252"/>
      </g>

      
      <g id="rayCallout" class="rayCallout ray-callout">
        <rect x="110" y="112" width="108" height="24" rx="5" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1"/>
        <text x="164" y="128" text-anchor="middle" font-size="12" font-weight="700" fill="#1d4ed8">Gamma rays (γ)</text>
        <line x1="218" y1="124" x2="242" y2="134" stroke="#2563eb" stroke-width="1.5" marker-end="url(#rayArrow)"/>
      </g>

      
      <g transform="translate(90, 210)">
        <text x="0" y="32" font-size="36" text-anchor="middle">🍓</text>
        
        <text x="-18" y="10" class="microbe">🦠</text>
        <text x="14" y="15" class="microbe">🦠</text>
        <text x="0" y="58" text-anchor="middle" class="label-sub">Bacteria present</text>
      </g>

      
      <g transform="translate(270, 210)">
        <text x="0" y="32" font-size="36" text-anchor="middle">🍓</text>
        
        <g id="bacteriaDying" class="bacteria-dying">
          <text x="-18" y="10" class="microbe" opacity="0.65">🦠</text>
          <text x="-18" y="10" font-size="13" fill="#dc2626" font-weight="900">✕</text>
          <text x="14" y="15" class="microbe" opacity="0.65">🦠</text>
          <text x="14" y="15" font-size="13" fill="#dc2626" font-weight="900">✕</text>
          <text x="0" y="58" text-anchor="middle" font-size="12" font-weight="700" fill="#1d4ed8">Bacteria killed</text>
        </g>
        
        <g id="bacteriaIdle" class="bacteria-idle">
          <text x="-18" y="10" class="microbe">🦠</text>
          <text x="14" y="15" class="microbe">🦠</text>
          <text x="0" y="58" text-anchor="middle" class="label-sub">Source is off</text>
        </g>
      </g>

      
      <g transform="translate(450, 210)">
        <text x="0" y="32" font-size="36" text-anchor="middle">🍓</text>
        
        <text x="16" y="8" font-size="16" fill="#eab308">✦</text>
        <text x="-20" y="14" font-size="13" fill="#eab308">✦</text>
        <text x="0" y="58" text-anchor="middle" class="label-sub">Safe &amp; sterile</text>

        
        <g transform="translate(-64, -156)">
          <rect x="0" y="0" width="128" height="56" rx="8" fill="url(#sensorGrad)" stroke="#cbd5e1" stroke-width="1.5"/>
          <text x="64" y="24" text-anchor="middle" class="detector-badge">0 Bq</text>
          <text x="64" y="44" text-anchor="middle" class="detector-sub">NOT radioactive</text>
          
          
          <line x1="64" y1="56" x2="64" y2="108" stroke="#64748b" stroke-width="1.8" stroke-dasharray="3 3"/>
          <circle cx="64" cy="110" r="3.5" fill="#475569"/>
        </g>
      </g>
    </svg>
  </div>

  <script>
    let isSourceOn = true;

    function toggleSource() {
      isSourceOn = !isSourceOn;
      const stage = document.getElementById('stage');
      const btn = document.getElementById('toggleBtn');
      const btnLabel = document.getElementById('btnLabel');
      const statusSummary = document.getElementById('statusSummary');

      if (isSourceOn) {
        stage.classList.remove('is-off');
        btn.classList.remove('off');
        btnLabel.textContent = 'Turn Source OFF';
        statusSummary.textContent = 'Cobalt-60 gamma sterilizer active';
      } else {
        stage.classList.add('is-off');
        btn.classList.add('off');
        btnLabel.textContent = 'Turn Source ON';
        statusSummary.textContent = 'Gamma source stopped (Safe/Idle)';
      }
    }
  </script>
</body>
</html>

UK-GCSE-SCIENCE-PHYS-AST-02-06

Aligned learning resources

Related diagrams