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The recent developement in ^\u003c14\u003eC measurements by accelerator mass spectrome-tory (AMS) has been reduced amounts of carbon and its application has been expanded largely to many new fields. However, several difficulties have been remained in dealing with small amounts of carbon. We have improved the H_2 reduction method with iron powder (Vorgel, et al., 1984,1987) and developed a simple and reliable method of graphite target preparation applicable to samples of sub-milligram carbon. The targets have intense and long-lived ion beams and extremely low ^\u003c14\u003eC background and have allowed us to achieve : (1) For samples in the range of 0.2-3mg carbon, ^\u003c14\u003eC background of targets from coal is 0.11% modern on average (equivalent age 55kyr) and do not vary with the amount of carbon. (2) The isotopic fractionation during the preparation is within 3\u3013. (3) The beam intensity of produced targets is typically 75% of that of natural graphite. The required time to accumulate 10,000 counts of ^\u003c14\u003eC for a modern sample is 10-15 minutes. (4) Some samples for duration tests of beam currents yield stable currents that decrease gradually and extreamly stable isotope ratio (^\u003c14\u003eC/^\u003c13\u003eC). The AMS ^\u003c14\u003eC measurements for milligram to sub-milligram carbon are made possible with high accuracies.", "subitem_description_type": "Abstract"}]}, "item_9_identifier_registration": {"attribute_name": "ID\u767b\u9332", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.18999/sumrua.2.113", "subitem_identifier_reg_type": "JaLC"}]}, "item_9_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u540d\u53e4\u5c4b\u5927\u5b66\u5e74\u4ee3\u6e2c\u5b9a\u8cc7\u6599\u7814\u7a76\u30bb\u30f3\u30bf\u30fc \u5929\u7136\u653e\u5c04\u6027\u5143\u7d20\u6e2c\u5b9a\u5c0f\u59d4\u54e1\u4f1a"}]}, "item_9_relation_43": {"attribute_name": "\u7570\u7248\u3067\u3042\u308b", "attribute_value_mlt": [{"subitem_relation_type": "isVersionOf", "subitem_relation_type_id": {"subitem_relation_type_id_text": "http://ci.nii.ac.jp/naid/110000475778/", "subitem_relation_type_select": "URI"}}]}, "item_9_rights_12": {"attribute_name": "\u6a29\u5229", 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