{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:PS7QVPGT2XWW45QBU4RSHIJF2D","short_pith_number":"pith:PS7QVPGT","canonical_record":{"source":{"id":"1901.10796","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2019-01-18T17:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"e4a6e5a3cf856c6be1e2728f0c8a3069bb8c2144b7fdeee66b16ea1cf42b9bfe","abstract_canon_sha256":"42754160da12b6652cece14dac6566111c6e3ab75c07c2ecbf5b1ccc1daa68c5"},"schema_version":"1.0"},"canonical_sha256":"7cbf0abcd3d5ed6e7601a72323a125d0faa9fc9251954e0e7e16b3536e91547f","source":{"kind":"arxiv","id":"1901.10796","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.10796","created_at":"2026-05-17T23:55:06Z"},{"alias_kind":"arxiv_version","alias_value":"1901.10796v1","created_at":"2026-05-17T23:55:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.10796","created_at":"2026-05-17T23:55:06Z"},{"alias_kind":"pith_short_12","alias_value":"PS7QVPGT2XWW","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"PS7QVPGT2XWW45QB","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"PS7QVPGT","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:PS7QVPGT2XWW45QBU4RSHIJF2D","target":"record","payload":{"canonical_record":{"source":{"id":"1901.10796","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2019-01-18T17:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"e4a6e5a3cf856c6be1e2728f0c8a3069bb8c2144b7fdeee66b16ea1cf42b9bfe","abstract_canon_sha256":"42754160da12b6652cece14dac6566111c6e3ab75c07c2ecbf5b1ccc1daa68c5"},"schema_version":"1.0"},"canonical_sha256":"7cbf0abcd3d5ed6e7601a72323a125d0faa9fc9251954e0e7e16b3536e91547f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:06.005669Z","signature_b64":"b6tyyOOb55TKuapEf7LbGPTCcFPLaEFfRpeMevNU1Q0O3uL05socEMa8CqS/cpZvwQHMeSRuTSJpXb7PxjoTCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7cbf0abcd3d5ed6e7601a72323a125d0faa9fc9251954e0e7e16b3536e91547f","last_reissued_at":"2026-05-17T23:55:06.005248Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:06.005248Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.10796","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":"2026-05-17T23:55:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LRJhIli52D+929M+4rCZe2S9W7EGFSueQWl/p6WTt+krej5LzY8dXnz1oBz3FZJEJBYqwApja8Lr+QJia2bnDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T06:43:31.513338Z"},"content_sha256":"1dd611186a5b26ef20602801ba2b1e8ec0686d01bc63915f90b993dce330104e","schema_version":"1.0","event_id":"sha256:1dd611186a5b26ef20602801ba2b1e8ec0686d01bc63915f90b993dce330104e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:PS7QVPGT2XWW45QBU4RSHIJF2D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Training Future Engineers to Be Ghostbusters: Hunting for the Spectral Environmental Radioactivity","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"Andrea Serafini, Carlo Bottardi, Enrico Chiarelli, Fabio Mantovani, Kassandra Giulia Cristina Raptis, Marica Baldoncini, Matteo Alb\\'eri, Sheldon Landsberger, Virginia Strati","submitted_at":"2019-01-18T17:04:13Z","abstract_excerpt":"Although environmental radioactivity is all around us, the collective public imagination often associates a negative feeling to this natural phenomenon. To increase the familiarity with this phenomenon we have designed, implemented, and tested an interdisciplinary educational activity for pre-collegiate students in which nuclear engineering and computer science are ancillary to the comprehension of basic physics concepts. Teaching and training experiences are performed by using a 4\" x 4\" NaI(Tl) detector for in-situ and laboratory {\\gamma}-ray spectroscopy measurements. Students are asked to d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.10796","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":""},"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":"2026-05-17T23:55:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q6eKultyNYCAJuXZviZUbhpyZH4ELb/42B6UaVyW90qjvrV+tlh3Pv4hN5xNq6m5krwQAOQbFlyIVnoZA19gAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T06:43:31.514033Z"},"content_sha256":"dcdd63be2324f27e39835de95874aa34052df666051c6e163eb1805632952402","schema_version":"1.0","event_id":"sha256:dcdd63be2324f27e39835de95874aa34052df666051c6e163eb1805632952402"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PS7QVPGT2XWW45QBU4RSHIJF2D/bundle.json","state_url":"https://pith.science/pith/PS7QVPGT2XWW45QBU4RSHIJF2D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PS7QVPGT2XWW45QBU4RSHIJF2D/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":"2026-06-11T06:43:31Z","links":{"resolver":"https://pith.science/pith/PS7QVPGT2XWW45QBU4RSHIJF2D","bundle":"https://pith.science/pith/PS7QVPGT2XWW45QBU4RSHIJF2D/bundle.json","state":"https://pith.science/pith/PS7QVPGT2XWW45QBU4RSHIJF2D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PS7QVPGT2XWW45QBU4RSHIJF2D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:PS7QVPGT2XWW45QBU4RSHIJF2D","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":"42754160da12b6652cece14dac6566111c6e3ab75c07c2ecbf5b1ccc1daa68c5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2019-01-18T17:04:13Z","title_canon_sha256":"e4a6e5a3cf856c6be1e2728f0c8a3069bb8c2144b7fdeee66b16ea1cf42b9bfe"},"schema_version":"1.0","source":{"id":"1901.10796","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.10796","created_at":"2026-05-17T23:55:06Z"},{"alias_kind":"arxiv_version","alias_value":"1901.10796v1","created_at":"2026-05-17T23:55:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.10796","created_at":"2026-05-17T23:55:06Z"},{"alias_kind":"pith_short_12","alias_value":"PS7QVPGT2XWW","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"PS7QVPGT2XWW45QB","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"PS7QVPGT","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:dcdd63be2324f27e39835de95874aa34052df666051c6e163eb1805632952402","target":"graph","created_at":"2026-05-17T23:55:06Z","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"},"paper":{"abstract_excerpt":"Although environmental radioactivity is all around us, the collective public imagination often associates a negative feeling to this natural phenomenon. To increase the familiarity with this phenomenon we have designed, implemented, and tested an interdisciplinary educational activity for pre-collegiate students in which nuclear engineering and computer science are ancillary to the comprehension of basic physics concepts. Teaching and training experiences are performed by using a 4\" x 4\" NaI(Tl) detector for in-situ and laboratory {\\gamma}-ray spectroscopy measurements. Students are asked to d","authors_text":"Andrea Serafini, Carlo Bottardi, Enrico Chiarelli, Fabio Mantovani, Kassandra Giulia Cristina Raptis, Marica Baldoncini, Matteo Alb\\'eri, Sheldon Landsberger, Virginia Strati","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2019-01-18T17:04:13Z","title":"Training Future Engineers to Be Ghostbusters: Hunting for the Spectral Environmental Radioactivity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.10796","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":"sha256:1dd611186a5b26ef20602801ba2b1e8ec0686d01bc63915f90b993dce330104e","target":"record","created_at":"2026-05-17T23:55:06Z","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":"42754160da12b6652cece14dac6566111c6e3ab75c07c2ecbf5b1ccc1daa68c5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2019-01-18T17:04:13Z","title_canon_sha256":"e4a6e5a3cf856c6be1e2728f0c8a3069bb8c2144b7fdeee66b16ea1cf42b9bfe"},"schema_version":"1.0","source":{"id":"1901.10796","kind":"arxiv","version":1}},"canonical_sha256":"7cbf0abcd3d5ed6e7601a72323a125d0faa9fc9251954e0e7e16b3536e91547f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7cbf0abcd3d5ed6e7601a72323a125d0faa9fc9251954e0e7e16b3536e91547f","first_computed_at":"2026-05-17T23:55:06.005248Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:06.005248Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"b6tyyOOb55TKuapEf7LbGPTCcFPLaEFfRpeMevNU1Q0O3uL05socEMa8CqS/cpZvwQHMeSRuTSJpXb7PxjoTCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:06.005669Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.10796","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1dd611186a5b26ef20602801ba2b1e8ec0686d01bc63915f90b993dce330104e","sha256:dcdd63be2324f27e39835de95874aa34052df666051c6e163eb1805632952402"],"state_sha256":"896ee1ee988b03d6b2e5c80361daffecd70bf3335007f6210c1f0e7e70e687be"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AsLlUAVvP/UEJ5LoS4VpaOar/V7TstU7WUUukyWQAgVl4vjD7mbr+Iz6IK33YNOsP4veayAd3g+H0lCjFyXaBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T06:43:31.518010Z","bundle_sha256":"f329a20219d0a81265355b68ccebb2971eef909a32ac71a4ff5fd2feb1c645b0"}}