{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T05:47:51Z","timestamp":1785822471449,"version":"3.56.0"},"reference-count":15,"publisher":"IOP Publishing","issue":"4","license":[{"start":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T00:00:00Z","timestamp":1785801600000},"content-version":"vor","delay-in-days":3,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T00:00:00Z","timestamp":1785801600000},"content-version":"tdm","delay-in-days":3,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Biomed. Phys. Eng. Express"],"published-print":{"date-parts":[[2026,8,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>The RSCAN PP20 prototype plane-parallel ionization chamber was evaluated for electron beam dosimetry and medium-energy kilovoltage x-ray beam measurements. This study investigated its response constancy, linearity, depth-ionization characteristics, voltage and polarity dependence, and signal stability in water using a 6 MeV electron beam and selected kilovoltage x-ray beam qualities. Additional time-resolved measurements were performed to assess dark-field charge transients, post-irradiation charge relaxation, in-beam current transients, and cable-related parasitic currents, with a PTW Advanced Markus chamber used as a reference-control detector. In the 6 MeV electron beam, the RSCAN PP20 prototype produced physically plausible depth-ionization curves but showed insufficient quantitative stability. The coefficient of variation reached 1.57%, and the relative range reached 5.10%. The apparent linearity deviation reached 16.8% when background compensation was performed only once per measurement series, but decreased to 0.64% when repeated before each measurement. A polarity correction factor of approximately 0.91 was obtained across the tested voltage range, indicating measurement-chain asymmetry rather than a conventional intrinsic polarity effect. Time-resolved recordings revealed dark-field charge transients, post-beam charge accumulation, and mechanically induced bipolar current spikes, consistent with parasitic currents and possible cable-related triboelectric effects. Fixed-depth measurements in kilovoltage x-ray beams showed better short-term stability, whereas depth-response scans demonstrated cable-dependent distortions. The main limitation of the current RSCAN PP20 prototype is not its basic plane-parallel geometry, which is close to established clinical designs, but instability of the prototype chamber\u2013cable assembly within the tested measurement setup. The prototype is not yet suitable for routine clinical dosimetry in its current configuration and requires hardware improvements followed by comprehensive recharacterization.<\/jats:p>","DOI":"10.1088\/2057-1976\/ae90b0","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T22:47:46Z","timestamp":1785192466000},"page":"045053","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Dosimetric evaluation of the RSCAN PP20 prototype plane-parallel ionization chamber in electron and kilovoltage x-ray beams"],"prefix":"10.1088","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6409-6756","authenticated-orcid":true,"given":"A Yu","family":"Smyslov","sequence":"first","affiliation":[{"name":"Federal State Budgetary Institution Russian Scientific Center of Roentgenoradiology (RSCRR) of the Ministry of Healthcare of the Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-5802-5347","authenticated-orcid":false,"given":"A A","family":"Kokontsev","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Institution Russian Scientific Center of Roentgenoradiology (RSCRR) of the Ministry of Healthcare of the Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3596-343X","authenticated-orcid":false,"given":"A N","family":"Moiseev","sequence":"additional","affiliation":[{"name":"KB Osnovanie LLC"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-9603-3445","authenticated-orcid":false,"given":"V A","family":"Savelev","sequence":"additional","affiliation":[{"name":"KB Osnovanie LLC"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-4562-9729","authenticated-orcid":false,"given":"A V","family":"Anan\u2019ina","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Institution Russian Scientific Center of Roentgenoradiology (RSCRR) of the Ministry of Healthcare of the Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,8,4]]},"reference":[{"key":"bpexae90b0bib1","doi-asserted-by":"publisher","first-page":"741","DOI":"10.1118\/1.595446","type":"journal-article","article-title":"A protocol for the determination of absorbed dose from high-energy photon and electron beams","volume":"10","author":"AAPM Task Group 21","year":"1983","journal-title":"Med. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2026-03-09","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-07-27","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-08-04","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}