{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:VZU64A5LGK4KEZS7CQK7L5DMDX","short_pith_number":"pith:VZU64A5L","canonical_record":{"source":{"id":"1704.06886","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-04-23T05:49:24Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"bbf5c68e1eb2ec9374813d808bf8b8f4a24add286328fd2dc77195d37684546b","abstract_canon_sha256":"f88a846d16df56e73f900b2fe5e8b272d6ed20faf42cfe79559ea92d636b8bf3"},"schema_version":"1.0"},"canonical_sha256":"ae69ee03ab32b8a2665f1415f5f46c1de658c15c488d50cc917a513fe454a854","source":{"kind":"arxiv","id":"1704.06886","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1704.06886","created_at":"2026-05-18T00:45:55Z"},{"alias_kind":"arxiv_version","alias_value":"1704.06886v1","created_at":"2026-05-18T00:45:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.06886","created_at":"2026-05-18T00:45:55Z"},{"alias_kind":"pith_short_12","alias_value":"VZU64A5LGK4K","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"VZU64A5LGK4KEZS7","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"VZU64A5L","created_at":"2026-05-18T12:31:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:VZU64A5LGK4KEZS7CQK7L5DMDX","target":"record","payload":{"canonical_record":{"source":{"id":"1704.06886","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-04-23T05:49:24Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"bbf5c68e1eb2ec9374813d808bf8b8f4a24add286328fd2dc77195d37684546b","abstract_canon_sha256":"f88a846d16df56e73f900b2fe5e8b272d6ed20faf42cfe79559ea92d636b8bf3"},"schema_version":"1.0"},"canonical_sha256":"ae69ee03ab32b8a2665f1415f5f46c1de658c15c488d50cc917a513fe454a854","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:45:55.452000Z","signature_b64":"wQty2FYkXNUxivOkHSuxFzJn+mC2qb+Ex6unovahQALbL0XzUdCKgmBnEp4AcpXJWEYiQTke8xrK2G3n8zxMDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ae69ee03ab32b8a2665f1415f5f46c1de658c15c488d50cc917a513fe454a854","last_reissued_at":"2026-05-18T00:45:55.451263Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:45:55.451263Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1704.06886","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":"2026-05-18T00:45:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c2EDU40WFWXszBF9xwTzVRvWApB9oiRKJU6CmKjiovv3w8Uheho4zcnXu/JexKXu/mhdYrX5xpsI2tZ75RFnCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T12:18:26.435850Z"},"content_sha256":"8d115bafaa191b66ecacc6088a0cce705984a1d7ced3df08c1af1589c1e5e383","schema_version":"1.0","event_id":"sha256:8d115bafaa191b66ecacc6088a0cce705984a1d7ced3df08c1af1589c1e5e383"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:VZU64A5LGK4KEZS7CQK7L5DMDX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of Radon Concentration in Super-Kamiokande's Buffer Gas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"physics.ins-det","authors_text":"H. Sekiya, M. Matsubara, M. Nakahata, R. A. Wendell, S. Tasaka, Y. Nakano, Y. Takeuchi","submitted_at":"2017-04-23T05:49:24Z","abstract_excerpt":"To precisely measure radon concentrations in purified air supplied to the Super-Kamiokande detector as a buffer gas, we have developed a highly sensitive radon detector with an intrinsic background as low as 0.33$\\pm$0.07 mBq/m$^{3}$. In this article, we discuss the construction and calibration of this detector as well as results of its application to the measurement and monitoring of the buffer gas layer above Super-Kamiokande. In March 2013, the chilled activated charcoal system used to remove radon in the input buffer gas was upgraded. After this improvement, a dramatic reduction in the rad"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.06886","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":"2026-05-18T00:45:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2pJgvGKxIsY4MEU1jN4i6PzcBaxChuFbY5oYSu5YakkDddpbRTNPZV3Hk+1RLG0ycZib+WSACC2rfX2pOOVuDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T12:18:26.436195Z"},"content_sha256":"518d5931e1666d766501935538c092c089163b93a77661007f2fb4e09ed778ba","schema_version":"1.0","event_id":"sha256:518d5931e1666d766501935538c092c089163b93a77661007f2fb4e09ed778ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VZU64A5LGK4KEZS7CQK7L5DMDX/bundle.json","state_url":"https://pith.science/pith/VZU64A5LGK4KEZS7CQK7L5DMDX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VZU64A5LGK4KEZS7CQK7L5DMDX/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":"2026-06-08T12:18:26Z","links":{"resolver":"https://pith.science/pith/VZU64A5LGK4KEZS7CQK7L5DMDX","bundle":"https://pith.science/pith/VZU64A5LGK4KEZS7CQK7L5DMDX/bundle.json","state":"https://pith.science/pith/VZU64A5LGK4KEZS7CQK7L5DMDX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VZU64A5LGK4KEZS7CQK7L5DMDX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:VZU64A5LGK4KEZS7CQK7L5DMDX","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":"f88a846d16df56e73f900b2fe5e8b272d6ed20faf42cfe79559ea92d636b8bf3","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-04-23T05:49:24Z","title_canon_sha256":"bbf5c68e1eb2ec9374813d808bf8b8f4a24add286328fd2dc77195d37684546b"},"schema_version":"1.0","source":{"id":"1704.06886","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1704.06886","created_at":"2026-05-18T00:45:55Z"},{"alias_kind":"arxiv_version","alias_value":"1704.06886v1","created_at":"2026-05-18T00:45:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.06886","created_at":"2026-05-18T00:45:55Z"},{"alias_kind":"pith_short_12","alias_value":"VZU64A5LGK4K","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"VZU64A5LGK4KEZS7","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"VZU64A5L","created_at":"2026-05-18T12:31:49Z"}],"graph_snapshots":[{"event_id":"sha256:518d5931e1666d766501935538c092c089163b93a77661007f2fb4e09ed778ba","target":"graph","created_at":"2026-05-18T00:45:55Z","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":"To precisely measure radon concentrations in purified air supplied to the Super-Kamiokande detector as a buffer gas, we have developed a highly sensitive radon detector with an intrinsic background as low as 0.33$\\pm$0.07 mBq/m$^{3}$. In this article, we discuss the construction and calibration of this detector as well as results of its application to the measurement and monitoring of the buffer gas layer above Super-Kamiokande. In March 2013, the chilled activated charcoal system used to remove radon in the input buffer gas was upgraded. After this improvement, a dramatic reduction in the rad","authors_text":"H. Sekiya, M. Matsubara, M. Nakahata, R. A. Wendell, S. Tasaka, Y. Nakano, Y. Takeuchi","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-04-23T05:49:24Z","title":"Measurement of Radon Concentration in Super-Kamiokande's Buffer Gas"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.06886","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":"sha256:8d115bafaa191b66ecacc6088a0cce705984a1d7ced3df08c1af1589c1e5e383","target":"record","created_at":"2026-05-18T00:45:55Z","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":"f88a846d16df56e73f900b2fe5e8b272d6ed20faf42cfe79559ea92d636b8bf3","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-04-23T05:49:24Z","title_canon_sha256":"bbf5c68e1eb2ec9374813d808bf8b8f4a24add286328fd2dc77195d37684546b"},"schema_version":"1.0","source":{"id":"1704.06886","kind":"arxiv","version":1}},"canonical_sha256":"ae69ee03ab32b8a2665f1415f5f46c1de658c15c488d50cc917a513fe454a854","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ae69ee03ab32b8a2665f1415f5f46c1de658c15c488d50cc917a513fe454a854","first_computed_at":"2026-05-18T00:45:55.451263Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:45:55.451263Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wQty2FYkXNUxivOkHSuxFzJn+mC2qb+Ex6unovahQALbL0XzUdCKgmBnEp4AcpXJWEYiQTke8xrK2G3n8zxMDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:45:55.452000Z","signed_message":"canonical_sha256_bytes"},"source_id":"1704.06886","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8d115bafaa191b66ecacc6088a0cce705984a1d7ced3df08c1af1589c1e5e383","sha256:518d5931e1666d766501935538c092c089163b93a77661007f2fb4e09ed778ba"],"state_sha256":"01e924e5d930643da21306117094c77f860d1062cea5713b47928d04f6b5c4ef"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oqrEVQN8qejDIqcCLgEKjmHqdqbzuSm2sywbRDnCIdbqkeRWuHtZ4xrztzFX1XlEXf3rqyDAXdBR6LspYjaADA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T12:18:26.438184Z","bundle_sha256":"35a459e33b305e877743837606ac64548a7c173ac2f581d871d9bf592b745b27"}}