"low-background" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "low-background (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Radioactivity",
          "orig": "en:Radioactivity",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "low-background environment"
        },
        {
          "word": "low-background facility"
        },
        {
          "word": "low-background lab"
        },
        {
          "word": "low-background laboratory"
        },
        {
          "word": "low-background lead"
        },
        {
          "word": "low-background metal"
        },
        {
          "word": "low-background room"
        },
        {
          "word": "low-background steel"
        }
      ],
      "glosses": [
        "Pertaining to having a significantly lower level of inherent, background radiation than usual."
      ],
      "id": "en-low-background-en-adj-YZKVIkjV",
      "links": [
        [
          "background radiation",
          "background radiation"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "low-background"
}

{
  "derived": [
    {
      "word": "low-background environment"
    },
    {
      "word": "low-background facility"
    },
    {
      "word": "low-background lab"
    },
    {
      "word": "low-background laboratory"
    },
    {
      "word": "low-background lead"
    },
    {
      "word": "low-background metal"
    },
    {
      "word": "low-background room"
    },
    {
      "word": "low-background steel"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "low-background (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Radioactivity"
      ],
      "glosses": [
        "Pertaining to having a significantly lower level of inherent, background radiation than usual."
      ],
      "links": [
        [
          "background radiation",
          "background radiation"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "low-background"
}