{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:GRB5JTKAJSZHQE5Y4TDBMCAZMV","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":"cf60260623a5e32b4eacf013f74e81d6fc0b1280d0b52400d21e0f431de16178","cross_cats_sorted":["astro-ph.IM","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","title_canon_sha256":"0187a351853db8a2fcfd8a23c911b3f8b6b00fae6caa0b962d0fd6e104d9c12f"},"schema_version":"1.0","source":{"id":"2002.10440","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10440","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10440v1","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10440","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_12","alias_value":"GRB5JTKAJSZH","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_16","alias_value":"GRB5JTKAJSZHQE5Y","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_8","alias_value":"GRB5JTKA","created_at":"2026-07-05T01:12:38Z"}],"graph_snapshots":[{"event_id":"sha256:005125d7c3533d56f8c4e71c8f4aed4485ee37c9aa2500c7bc97c10c41f18ed4","target":"graph","created_at":"2026-07-05T01:12:38Z","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/2002.10440/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Airborne gamma-ray surveys are useful for many applications, ranging from geology and mining to public health and nuclear security. In all these contexts, the ability to decompose a measured spectrum into a linear combination of background source terms can provide useful insights into the data and lead to improvements over techniques that use spectral energy windows. Multiple methods for the linear decomposition of spectra exist but are subject to various drawbacks, such as allowing negative photon fluxes or requiring detailed Monte Carlo modeling. We propose using Non-negative Matrix Factoriz","authors_text":"A. Zoglauer, B. J. Quiter, K. J. Bilton, M. S. Bandstra, T. H. Y. Joshi","cross_cats":["astro-ph.IM","physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","title":"Modeling Aerial Gamma-Ray Backgrounds using Non-negative Matrix Factorization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10440","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":"sha256:7049c410acb66b90349686bd0197803bb8bee14e79ffcdeb434d3aa072920fa5","target":"record","created_at":"2026-07-05T01:12:38Z","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":"cf60260623a5e32b4eacf013f74e81d6fc0b1280d0b52400d21e0f431de16178","cross_cats_sorted":["astro-ph.IM","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","title_canon_sha256":"0187a351853db8a2fcfd8a23c911b3f8b6b00fae6caa0b962d0fd6e104d9c12f"},"schema_version":"1.0","source":{"id":"2002.10440","kind":"arxiv","version":1}},"canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","first_computed_at":"2026-07-05T01:12:38.837334Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:12:38.837334Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Tezf/OAupabf+lDheDGbVGJyupeYAsX5AHJbwgtPR+wlWCd0LDdwR8Z26V8attdfEemkJXP/qM0P5srN1mACBA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:12:38.837980Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.10440","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7049c410acb66b90349686bd0197803bb8bee14e79ffcdeb434d3aa072920fa5","sha256:005125d7c3533d56f8c4e71c8f4aed4485ee37c9aa2500c7bc97c10c41f18ed4"],"state_sha256":"fc0270831348fdd843de4390fddeeda3005e029b13a0b03c828911c5100da65c"}