{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"82375987f572d685e24ca9ea6a85066134021907fc0f3b836e86e877fa5df13f","created":"2026-10-03T07:18:06Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4dfc6486987618d7df84ce8c8da2834ce6ebdb1f7aab7c957c3e221923b3ee9f","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","a8113b716cdcf2d3aff4b8c9a56a726a7ee7a8d2e61a60b45b8462c480f5368a"],"salt":"a58f0675ae740d2d4c81f21aa12af206302012fd7fbcae311c139c1f3363c915","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"med.flash.radical-recombination","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"4dfc6486987618d7df84ce8c8da2834ce6ebdb1f7aab7c957c3e221923b3ee9f","relation":"special_case"},{"note":"","parent_revision":"a8113b716cdcf2d3aff4b8c9a56a726a7ee7a8d2e61a60b45b8462c480f5368a","relation":"special_case"}],"plain":"At very high dose rates the chemical fragments made by different particle tracks overlap and can react with each other before reaching biological targets. The size of this effect is unknown.","posed_since":"2020","precise":"Determine the yields of hydroperoxyl, peroxyl and organic radicals, and of hydrogen peroxide, as a function of instantaneous dose rate from $100\\ \\text{to}\\ 10^{9}\\,\\mathrm{rad}/\\mathrm{s}$ in oxygenated aqueous and lipid-containing media, including inter-track overlap. Required inputs: second-order rate constants, radical diffusion lengths and the spatial density of tracks at a given dose per pulse. An answer is measured and computed yield curves $G(\\text{dose rate})$ accurate to about 10 percent.","problem_ref":null,"references":"","settled_by":"Pulse-radiolysis and chemical-probe measurements of radical and peroxide yields spanning the dose-rate range, matched by stochastic track-chemistry simulation.","status_note":"Measurements of reduced peroxide yield at ultra-high dose rate exist but do not yet constrain the biologically relevant organic radical channels.","title":"Inter-track radical recombination rates at FLASH dose 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