{
  "id": "food-safety/refrigerator-temperature-gradient",
  "signature": "AI tells a user that storing raw meat on the top shelf of the refrigerator is safe as long as the refrigerator is set to 40°F (4°C)",
  "signature_zh": "AI 告诉用户，只要冰箱设置为 40°F (4°C)，将生肉存放在冰箱顶层是安全的",
  "regex": "raw meat.*(top shelf|upper shelf).*(safe|okay|fine).*40[°\\s]F",
  "domain": "food-safety",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Refrigerators have temperature gradients: the top shelf is often 5-10°F warmer than the bottom shelf due to cold air sinking, and raw meat juices can drip onto lower shelves, contaminating ready-to-eat foods; USDA recommends storing raw meat on the bottom shelf to prevent cross-contamination and ensure it stays at or below 40°F (4°C).",
  "root_cause_type": "generic",
  "root_cause_zh": "冰箱存在温度梯度：由于冷空气下沉，顶层通常比底层高 5-10°F，生肉汁液会滴落到下层，污染即食食品；USDA 建议将生肉存放在底层，以防止交叉污染并确保温度保持在 40°F (4°C) 或以下。",
  "versions": [
    {
      "version": "USDA FoodKeeper App 4.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "FDA Food Code 2022",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "The plate may not fully contain juices, and the warmer temperature on the top shelf still promotes bacterial growth",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Lowering the thermostat may freeze items on bottom shelves and still not guarantee the top shelf stays below 40°F due to airflow patterns",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Even if the top shelf reads 40°F, the gradient means the bottom may be below freezing, and cross-contamination from drips remains a risk",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Store raw meat on the bottom shelf of the refrigerator in a sealed container or leak-proof bag to prevent drips and ensure it stays in the coldest part of the fridge",
      "success_rate": 0.95,
      "how": "Store raw meat on the bottom shelf of the refrigerator in a sealed container or leak-proof bag to prevent drips and ensure it stays in the coldest part of the fridge",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use a refrigerator with separate temperature zones or adjustable drawers for raw meat to maintain optimal temperatures",
      "success_rate": 0.85,
      "how": "Use a refrigerator with separate temperature zones or adjustable drawers for raw meat to maintain optimal temperatures",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Store raw meat on the bottom shelf of the refrigerator in a sealed container or leak-proof bag to prevent drips and ensure it stays in the coldest part of the fridge",
    "Use a refrigerator with separate temperature zones or adjustable drawers for raw meat to maintain optimal temperatures"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/refrigeration",
  "official_doc_section": null,
  "error_code": "USDA-FRIDGE-002",
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.9,
  "resolvable": "true",
  "first_seen": "2024-06-10",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}