{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:LPBKQ2DEE6TCX55DAS36S44MMA","short_pith_number":"pith:LPBKQ2DE","canonical_record":{"source":{"id":"2607.00270","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2026-06-30T23:35:51Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"c0e41e6ad591beecc9be5de83de595891833a117dfab179b7ba6c049ba5b8833","abstract_canon_sha256":"df1f6448fff0347d053a697a59e977d64b8c31fe36027c81c17931d1af592e4d"},"schema_version":"1.0"},"canonical_sha256":"5bc2a8686427a62bf7a304b7e9738c603439d2d02fba9280e0e7ad0bbbf31cb7","source":{"kind":"arxiv","id":"2607.00270","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.00270","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"arxiv_version","alias_value":"2607.00270v1","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.00270","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"pith_short_12","alias_value":"LPBKQ2DEE6TC","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"pith_short_16","alias_value":"LPBKQ2DEE6TCX55D","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"pith_short_8","alias_value":"LPBKQ2DE","created_at":"2026-07-02T00:18:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:LPBKQ2DEE6TCX55DAS36S44MMA","target":"record","payload":{"canonical_record":{"source":{"id":"2607.00270","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2026-06-30T23:35:51Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"c0e41e6ad591beecc9be5de83de595891833a117dfab179b7ba6c049ba5b8833","abstract_canon_sha256":"df1f6448fff0347d053a697a59e977d64b8c31fe36027c81c17931d1af592e4d"},"schema_version":"1.0"},"canonical_sha256":"5bc2a8686427a62bf7a304b7e9738c603439d2d02fba9280e0e7ad0bbbf31cb7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-02T00:18:42.161134Z","signature_b64":"EzsUdECgBhwBpzPzmIFDhuVSW3H/+HPzibcW6NNmzg0GefMio84Knx16mIBJTzUctXS1fNHx9z3Ih0dIySMYBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5bc2a8686427a62bf7a304b7e9738c603439d2d02fba9280e0e7ad0bbbf31cb7","last_reissued_at":"2026-07-02T00:18:42.160135Z","signature_status":"signed_v1","first_computed_at":"2026-07-02T00:18:42.160135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.00270","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":"2026-07-02T00:18:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EXjpXVrPh25F9b9IwoWgBhMDzlwz0McQIMJlfvn4jEhx/yp7ylxCEs7CI5akCJ8z51soZWy+MvBXSjE2oiZQCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T18:10:45.506952Z"},"content_sha256":"545e7cb0aca45b154f93551c3b6a9823db125fb043251fdd11f50221f36625a6","schema_version":"1.0","event_id":"sha256:545e7cb0aca45b154f93551c3b6a9823db125fb043251fdd11f50221f36625a6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:LPBKQ2DEE6TCX55DAS36S44MMA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Computer vision-based neural networks for radioisotope identification in urban environments","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"physics.ins-det","authors_text":"Masen Bachleda, Peter Lalor","submitted_at":"2026-06-30T23:35:51Z","abstract_excerpt":"Algorithm development for radioisotope identification in mobile urban search scenarios face significant challenges from non-uniform backgrounds, momentary source encounters, and severe class imbalance between rare threat signatures and background measurements. We present a machine learning-based approach to this problem that converts list-mode gamma-ray data into two-dimensional waterfall spectrograms and applies computer vision architectures to the resulting images. Rather than treating waterfalls as conventional images, we employ a representation where consecutive time spectra can form input"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.00270","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/2607.00270/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":"2026-07-02T00:18:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gfmFhLPDHd3iHWPf74/RtvtSVPl6s0E2Qx8IOFuqCDqcEgZqj84h3CJJkDKtW4RNiW2sUBPSO0uO9OL3HyR1CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T18:10:45.507336Z"},"content_sha256":"19043165338685a024947e367f2c52c8a9ec00cf152c43a399089b6d545b05fb","schema_version":"1.0","event_id":"sha256:19043165338685a024947e367f2c52c8a9ec00cf152c43a399089b6d545b05fb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LPBKQ2DEE6TCX55DAS36S44MMA/bundle.json","state_url":"https://pith.science/pith/LPBKQ2DEE6TCX55DAS36S44MMA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LPBKQ2DEE6TCX55DAS36S44MMA/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":"2026-07-03T18:10:45Z","links":{"resolver":"https://pith.science/pith/LPBKQ2DEE6TCX55DAS36S44MMA","bundle":"https://pith.science/pith/LPBKQ2DEE6TCX55DAS36S44MMA/bundle.json","state":"https://pith.science/pith/LPBKQ2DEE6TCX55DAS36S44MMA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LPBKQ2DEE6TCX55DAS36S44MMA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:LPBKQ2DEE6TCX55DAS36S44MMA","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":"df1f6448fff0347d053a697a59e977d64b8c31fe36027c81c17931d1af592e4d","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2026-06-30T23:35:51Z","title_canon_sha256":"c0e41e6ad591beecc9be5de83de595891833a117dfab179b7ba6c049ba5b8833"},"schema_version":"1.0","source":{"id":"2607.00270","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.00270","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"arxiv_version","alias_value":"2607.00270v1","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.00270","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"pith_short_12","alias_value":"LPBKQ2DEE6TC","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"pith_short_16","alias_value":"LPBKQ2DEE6TCX55D","created_at":"2026-07-02T00:18:42Z"},{"alias_kind":"pith_short_8","alias_value":"LPBKQ2DE","created_at":"2026-07-02T00:18:42Z"}],"graph_snapshots":[{"event_id":"sha256:19043165338685a024947e367f2c52c8a9ec00cf152c43a399089b6d545b05fb","target":"graph","created_at":"2026-07-02T00:18:42Z","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/2607.00270/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Algorithm development for radioisotope identification in mobile urban search scenarios face significant challenges from non-uniform backgrounds, momentary source encounters, and severe class imbalance between rare threat signatures and background measurements. We present a machine learning-based approach to this problem that converts list-mode gamma-ray data into two-dimensional waterfall spectrograms and applies computer vision architectures to the resulting images. Rather than treating waterfalls as conventional images, we employ a representation where consecutive time spectra can form input","authors_text":"Masen Bachleda, Peter Lalor","cross_cats":["cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2026-06-30T23:35:51Z","title":"Computer vision-based neural networks for radioisotope identification in urban environments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.00270","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":"sha256:545e7cb0aca45b154f93551c3b6a9823db125fb043251fdd11f50221f36625a6","target":"record","created_at":"2026-07-02T00:18:42Z","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":"df1f6448fff0347d053a697a59e977d64b8c31fe36027c81c17931d1af592e4d","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ins-det","submitted_at":"2026-06-30T23:35:51Z","title_canon_sha256":"c0e41e6ad591beecc9be5de83de595891833a117dfab179b7ba6c049ba5b8833"},"schema_version":"1.0","source":{"id":"2607.00270","kind":"arxiv","version":1}},"canonical_sha256":"5bc2a8686427a62bf7a304b7e9738c603439d2d02fba9280e0e7ad0bbbf31cb7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5bc2a8686427a62bf7a304b7e9738c603439d2d02fba9280e0e7ad0bbbf31cb7","first_computed_at":"2026-07-02T00:18:42.160135Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-02T00:18:42.160135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EzsUdECgBhwBpzPzmIFDhuVSW3H/+HPzibcW6NNmzg0GefMio84Knx16mIBJTzUctXS1fNHx9z3Ih0dIySMYBQ==","signature_status":"signed_v1","signed_at":"2026-07-02T00:18:42.161134Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.00270","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:545e7cb0aca45b154f93551c3b6a9823db125fb043251fdd11f50221f36625a6","sha256:19043165338685a024947e367f2c52c8a9ec00cf152c43a399089b6d545b05fb"],"state_sha256":"95bec9187b6a6d2ed839a0a3304510f49df474c3bf00901cc5711de251cba3b6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"urfJb8Spoi2htPMTzzhZUqy0DWn0jmrEByp/pxZ801L///sHS0PIsHYLCAXRaMYSElECP3RxJ7YyYxFe867vAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-03T18:10:45.509268Z","bundle_sha256":"482481b802adfa48008531d4c7ab8c74621a59bb90873669c8134ea30a8ff981"}}