{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T16:56:57Z","timestamp":1792083417523,"version":"4.4.0"},"reference-count":24,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T00:00:00Z","timestamp":1791244800000},"content-version":"vor","delay-in-days":5,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T00:00:00Z","timestamp":1790812800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["aapm.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>The humidity correction factor, , for ionization chambers in radiation dosimetry has relied on a consensus value established in ICRU Report 31 nearly half a century\u00a0ago.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>This study aims to rigorously re\u2010evaluate this long\u2010standing consensus by employing modern\u00a0instrumentation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>First, the equilibration time for the cavity air was examined by implanting a miniaturized humidity sensor directly into the cavity of a broken commercial ionization chamber to address uncertainties regarding stabilization in recent reports. Second, the  was measured using a vacuum\u2010assisted gas exchange method, in which the air inside the cavity was exchanged actively. Finally, Monte Carlo simulations were performed to analyze energy deposition within the cavity, enabling the conversion of the measured  to the relative \u2010value.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The direct monitoring of humidity inside the cavity revealed that the equilibration time scale extended to several days, which was much longer than the time scales assumed in the recent reports. The measured  for the Co\u201060 beam exhibited slight but apparent differences from the long\u2010standing consensus: the measured  extrapolated to 0% relative humidity (RH) was 0.9962\u20130.9970, and the sudden response increase started from 0% RH to 40% RH (or possibly 30% RH). The derived relative \u2010value showed a roughly linear dependence on RH, which contrasted with the non\u2010linear behavior of the current consensus\u00a0curve.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Measurements using modern instrumentation indicate that the humidity dependence of  and the corresponding relative \u2010value for Co\u201060 beam quality differ slightly from the long\u2010standing consensus established in ICRU Report 31. Although these differences are of minor importance for practical dosimetry, they may be relevant to primary air\u2010kerma standards. The present results suggest that primary standard laboratories may re\u2010evaluate their uncertainty budgets in light of these\u00a0findings.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/mp.70697","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T17:36:21Z","timestamp":1791308181000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Revisiting the humidity correction \u2013 A challenge to the current consensus"],"prefix":"10.1002","volume":"53","author":[{"given":"Yuichiro","family":"Morishita","sequence":"first","affiliation":[{"name":"National Metrology Institute of Japan, AIST Tsukuba Ibaraki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hideki","family":"Yamaoka","sequence":"additional","affiliation":[{"name":"TOYO MEDIC Co., Ltd. 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