"Rb-Sr" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "kind": "topical",
          "langcode": "en",
          "name": "Radioactivity",
          "orig": "en:Radioactivity",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rubidium",
          "orig": "en:Rubidium",
          "parents": [
            "Alkali metals",
            "Chemical elements",
            "Metals",
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            "Metallurgy",
            "Chemistry",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Strontium",
          "orig": "en:Strontium",
          "parents": [
            "Alkaline earth metals",
            "Chemical elements",
            "Metals",
            "Matter",
            "Metallurgy",
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      "examples": [
        {
          "ref": "2012, Wolfe AP, Csank AZ, Reyes AV, McKellar RC, Tappert R, et al., \"Pristine Early Eocene Wood Buried Deeply in Kimberlite from Northern Canada\", PLoS ONE 7(9): e45537. doi:10.1371/journal.pone.0045537",
          "text": "The age of the Panda intrusion has been dated precisely by Rb-Sr determinations on kimberlitic phlogopite (n = 7), yielding a robust isochron of 53.3±0.6 Ma (Early Eocene, Ypresian)."
        }
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        "rubidium-strontium."
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  "word": "Rb-Sr"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Radioactivity",
        "en:Rubidium",
        "en:Strontium"
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          "ref": "2012, Wolfe AP, Csank AZ, Reyes AV, McKellar RC, Tappert R, et al., \"Pristine Early Eocene Wood Buried Deeply in Kimberlite from Northern Canada\", PLoS ONE 7(9): e45537. doi:10.1371/journal.pone.0045537",
          "text": "The age of the Panda intrusion has been dated precisely by Rb-Sr determinations on kimberlitic phlogopite (n = 7), yielding a robust isochron of 53.3±0.6 Ma (Early Eocene, Ypresian)."
        }
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        "rubidium-strontium."
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        "uncountable"
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  "word": "Rb-Sr"
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