{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"3c920e521b5c65b1bd26a0598d6f942405cbd948ba6d855d36483b3cc510b3f5","created":"2026-10-03T07:18:06Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"fd9134b18e139563c64450662ca3cbc984cb8ee28b867eea66333e55b49f56fb","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"med.dosimetry.three-dimensional-readout","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Modern treatments shape dose in three dimensions, but routine checks measure it at points or on planes. A trustworthy full-volume measurement does not exist.","posed_since":"1995","precise":"Develop a three-dimensional dosimeter with spatial resolution of 1 mm, dose accuracy of 2 percent, energy and dose-rate response within 1 percent of water, and traceability to a primary standard. Candidates: radiochromic and polymer gels, plastic scintillator volumes with optical tomography, and Cherenkov imaging. An answer is a demonstrated system meeting all four criteria simultaneously.","problem_ref":null,"references":"","settled_by":"Independent verification against calorimetry and ion chambers across modalities, including ion and ultra-high dose-rate beams.","status_note":"","title":"Traceable three-dimensional dose measurement","topic_ref":"be2989252171f9f987d92f4b562e96075370f97879f879218827602913f7731c"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ba4dc4f571ca924610e6af69089ceb8dde0b8bd8783de83fe87ef608d9903c01","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"01461be8b7d3aed81cbe85562dbb93bf796bf5a2851467c2f813a0470f33d466","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"OuciMwxBjUtAV13a0QXTBrDJ6WTk39s68SDmA5HQkrik_7LekN8_KVK8NK7W_oaRLBWx6f0OwtwrA7dGQxu_Cg"},"schema":"pubphys.envelope/1"},"record_hash":"ba4dc4f571ca924610e6af69089ceb8dde0b8bd8783de83fe87ef608d9903c01","leaf_index":1676}