{ "items" : [
    { "id" : "http://dbpedia.org/resource/Environmental_radioactivity"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Environmental radioactivity is produced by radioactive materials in the human environment.  While some radioisotopes, such as strontium-90 (90Sr) and technetium-99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium-40 (40K), are only present due to natural processes, a few isotopes, e.g. tritium (3H), result from both natural processes and human activities." ] ,
        "http://www.w3.org/2000/01/rdf-schema#seeAlso" : [ "http://dbpedia.org/resource/Natural_environment",
          "http://dbpedia.org/resource/Actinide"] } } }
