Question: who developed the first radiometric (absolute) dating technique
[{'answer': 'Bertram Boltwood', 'provenance': [{'wikipedia_id': '26298', 'title': 'Radiometric dating', 'start_paragraph_id': 1, 'start_character': 471, 'end_paragraph_id': 1, 'end_character': 487, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26298', 'title': 'Radiometric dating', 'start_paragraph_id': 1, 'start_character': 18, 'end_paragraph_id': 1, 'end_character': 748, 'bleu_score': 0.9477320387497401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17606791806422998968}, 'section': 'Section::::Abstract.'}]}]