{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:EBRGLC6ANVEYH5UOZPQGKRGO6F","short_pith_number":"pith:EBRGLC6A","canonical_record":{"source":{"id":"2501.13998","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2025-01-23T11:18:42Z","cross_cats_sorted":["physics.ao-ph"],"title_canon_sha256":"28b1c3b0a016f67124701f9ff6051ea384746a7f8354e9110b4629f70aff8fb3","abstract_canon_sha256":"700b0b921a59eaba9ae8979c22e0f27d006586810eaf9694e0bc3762551c88d5"},"schema_version":"1.0"},"canonical_sha256":"2062658bc06d4983f68ecbe06544cef15b1e488e29d624ea5d97937df3596073","source":{"kind":"arxiv","id":"2501.13998","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.13998","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"arxiv_version","alias_value":"2501.13998v1","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.13998","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"pith_short_12","alias_value":"EBRGLC6ANVEY","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"pith_short_16","alias_value":"EBRGLC6ANVEYH5UO","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"pith_short_8","alias_value":"EBRGLC6A","created_at":"2026-07-05T10:04:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:EBRGLC6ANVEYH5UOZPQGKRGO6F","target":"record","payload":{"canonical_record":{"source":{"id":"2501.13998","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2025-01-23T11:18:42Z","cross_cats_sorted":["physics.ao-ph"],"title_canon_sha256":"28b1c3b0a016f67124701f9ff6051ea384746a7f8354e9110b4629f70aff8fb3","abstract_canon_sha256":"700b0b921a59eaba9ae8979c22e0f27d006586810eaf9694e0bc3762551c88d5"},"schema_version":"1.0"},"canonical_sha256":"2062658bc06d4983f68ecbe06544cef15b1e488e29d624ea5d97937df3596073","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:04:43.801996Z","signature_b64":"Y0/pBRyFFnH1uOS355Cf0MxoearY5ZzRt/TUCixjFL3srX530YLzm4AR8zn/9BDyBYDL93BS4goHyYA/MxvoCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2062658bc06d4983f68ecbe06544cef15b1e488e29d624ea5d97937df3596073","last_reissued_at":"2026-07-05T10:04:43.801478Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:04:43.801478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.13998","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:04:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3NwNYD2uyExg+YA4L8QFQDxCuhUrO1KzFYdJelO9XE9Snc3wgBd2JrM7XPIR2/SPHPufDAzUNRFb/DEpw2PUCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T11:01:23.286389Z"},"content_sha256":"2bcbd7ccaaaf06bda8775e3cb766bc7cab2ee5fc13f99ea1c16fff9e80dd4bfa","schema_version":"1.0","event_id":"sha256:2bcbd7ccaaaf06bda8775e3cb766bc7cab2ee5fc13f99ea1c16fff9e80dd4bfa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:EBRGLC6ANVEYH5UOZPQGKRGO6F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterisation of the plutonium isotopic composition of a sediment core from Palomares, Spain, by low-energy AMS and alpha-spectrometry","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.ao-ph"],"primary_cat":"physics.ins-det","authors_text":"E. Chamizo, J.A. Sanchez-Cabeza, J.L. Mas, J. Merino, M.C. Jim\\'enez-Ramos, M. Garc\\'ia-Le\\'on, P. Masqu\\'e, R. Garc\\'ia-Tenorio, S.M. Enamorado","submitted_at":"2025-01-23T11:18:42Z","abstract_excerpt":"The measurement of plutonium isotopes, 239Pu and 240Pu, at 670 kV on the compact accelerator mass spectrometry (AMS) system at the Centro Nacional de Aceleradores (CNA) in Seville, Spain, is now a reality. In this work, we present first Pu AMS results for environmental samples: a sediment core collected in a submarine canyon in the Mediterranean coast of the Spanish region of Palomares, affected by a nuclear accident in 1966. From the study of the 240Pu/239Pu atomic ratio profile, showing on average levels lower than 11%, we confirm that the weapon-grade plutonium released on land during the a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.13998","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2501.13998/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:04:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y9fCye6EhEhYhm/yOqs0uGw9Dppx1aHYpXM4VgOhp5d/zMAybO1jgbzZ6i96PHGEoaXuO0v0BrzgDBTaZitfAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T11:01:23.289375Z"},"content_sha256":"cbdd943720453a89dbfaf6d55c8a67a5f614d2234c472e123a6450524981fa4f","schema_version":"1.0","event_id":"sha256:cbdd943720453a89dbfaf6d55c8a67a5f614d2234c472e123a6450524981fa4f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F/bundle.json","state_url":"https://pith.science/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-20T11:01:23Z","links":{"resolver":"https://pith.science/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F","bundle":"https://pith.science/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F/bundle.json","state":"https://pith.science/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EBRGLC6ANVEYH5UOZPQGKRGO6F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:EBRGLC6ANVEYH5UOZPQGKRGO6F","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"700b0b921a59eaba9ae8979c22e0f27d006586810eaf9694e0bc3762551c88d5","cross_cats_sorted":["physics.ao-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2025-01-23T11:18:42Z","title_canon_sha256":"28b1c3b0a016f67124701f9ff6051ea384746a7f8354e9110b4629f70aff8fb3"},"schema_version":"1.0","source":{"id":"2501.13998","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.13998","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"arxiv_version","alias_value":"2501.13998v1","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.13998","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"pith_short_12","alias_value":"EBRGLC6ANVEY","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"pith_short_16","alias_value":"EBRGLC6ANVEYH5UO","created_at":"2026-07-05T10:04:43Z"},{"alias_kind":"pith_short_8","alias_value":"EBRGLC6A","created_at":"2026-07-05T10:04:43Z"}],"graph_snapshots":[{"event_id":"sha256:cbdd943720453a89dbfaf6d55c8a67a5f614d2234c472e123a6450524981fa4f","target":"graph","created_at":"2026-07-05T10:04:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2501.13998/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The measurement of plutonium isotopes, 239Pu and 240Pu, at 670 kV on the compact accelerator mass spectrometry (AMS) system at the Centro Nacional de Aceleradores (CNA) in Seville, Spain, is now a reality. In this work, we present first Pu AMS results for environmental samples: a sediment core collected in a submarine canyon in the Mediterranean coast of the Spanish region of Palomares, affected by a nuclear accident in 1966. From the study of the 240Pu/239Pu atomic ratio profile, showing on average levels lower than 11%, we confirm that the weapon-grade plutonium released on land during the a","authors_text":"E. Chamizo, J.A. Sanchez-Cabeza, J.L. Mas, J. Merino, M.C. Jim\\'enez-Ramos, M. Garc\\'ia-Le\\'on, P. Masqu\\'e, R. Garc\\'ia-Tenorio, S.M. Enamorado","cross_cats":["physics.ao-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2025-01-23T11:18:42Z","title":"Characterisation of the plutonium isotopic composition of a sediment core from Palomares, Spain, by low-energy AMS and alpha-spectrometry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.13998","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:2bcbd7ccaaaf06bda8775e3cb766bc7cab2ee5fc13f99ea1c16fff9e80dd4bfa","target":"record","created_at":"2026-07-05T10:04:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"700b0b921a59eaba9ae8979c22e0f27d006586810eaf9694e0bc3762551c88d5","cross_cats_sorted":["physics.ao-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2025-01-23T11:18:42Z","title_canon_sha256":"28b1c3b0a016f67124701f9ff6051ea384746a7f8354e9110b4629f70aff8fb3"},"schema_version":"1.0","source":{"id":"2501.13998","kind":"arxiv","version":1}},"canonical_sha256":"2062658bc06d4983f68ecbe06544cef15b1e488e29d624ea5d97937df3596073","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2062658bc06d4983f68ecbe06544cef15b1e488e29d624ea5d97937df3596073","first_computed_at":"2026-07-05T10:04:43.801478Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:04:43.801478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Y0/pBRyFFnH1uOS355Cf0MxoearY5ZzRt/TUCixjFL3srX530YLzm4AR8zn/9BDyBYDL93BS4goHyYA/MxvoCg==","signature_status":"signed_v1","signed_at":"2026-07-05T10:04:43.801996Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.13998","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2bcbd7ccaaaf06bda8775e3cb766bc7cab2ee5fc13f99ea1c16fff9e80dd4bfa","sha256:cbdd943720453a89dbfaf6d55c8a67a5f614d2234c472e123a6450524981fa4f"],"state_sha256":"52e46732f98ef876de6c704c63698424e64407cc2c6b51f5bbd92c4d54be54e0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QgkC44UMdjMOr6AOQNWHYGT1uBvDBK1ELDES7sNsihv24A+CUUMQb4XsEf3Aylst3Py4jq49wkicSgOVckm1Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T11:01:23.300239Z","bundle_sha256":"c965c181d1436104aa048f6da22f0621d5a5130814e4580d7c817883b4b8e0f6"}}