{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,7]],"date-time":"2023-10-07T10:42:13Z","timestamp":1696675333512},"reference-count":8,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2000,6,1]],"date-time":"2000-06-01T00:00:00Z","timestamp":959817600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"funder":[{"DOI":"10.13039\/100000054","name":"National Cancer Institute","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000054","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Applied Clin Med Phys"],"published-print":{"date-parts":[[2000,6]]},"abstract":"A new calibration protocol, developed by the AAPM Task Group 51 (TG\u201051) to replace the TG\u201021 protocol, is based on an absorbed\u2010dose to water standard and calibration factor , while the TG\u201021 protocol is based on an exposure (or air\u2010kerma) standard and calibration factor . Because of differences between these standards and the two protocols, the results of clinical reference dosimetry based on TG\u201051 may be somewhat different from those based on TG\u201021. The Radiological Physics Center has conducted a systematic comparison between the two protocols, in which photon and electron beam outputs following both protocols were compared under identical conditions. Cylindrical chambers used in this study were selected from the list given in the TG\u201051 report, covering the majority of current manufacturers. Measured ratios between absorbed\u2010dose and air\u2010kerma calibration factors, derived from the standards traceable to the NIST, were compared with calculated values using the TG\u201021 protocol. The comparison suggests that there is roughly a 1% discrepancy between measured and calculated ratios. This discrepancy may provide a reasonable measure of possible changes between the absorbed\u2010dose to water determined by TG\u201051 and that determined by TG\u201021 for photon beam calibrations. The typical change in a 6 MV photon beam calibration following the implementation of the TG\u201051 protocol was about 1%, regardless of the chamber used, and the change was somewhat smaller for an 18 MV photon beam. On the other hand, the results for 9 and 16 MeV electron beams show larger changes up to 2%, perhaps because of the updated electron stopping power data used for the TG\u201051 protocol, in addition to the inherent 1% discrepancy presented in the calibration factors. The results also indicate that the changes may be dependent on the electron energy.<\/jats:p>PACS number(s): 87.66.\u2013a, 87.53.\u2013j<\/jats:p>","DOI":"10.1120\/jacmp.v1i3.2643","type":"journal-article","created":{"date-parts":[[2007,2,22]],"date-time":"2007-02-22T22:01:41Z","timestamp":1172181701000},"page":"108-115","source":"Crossref","is-referenced-by-count":9,"title":["Comparison between TG\u201051 and TG\u201021: Calibration of photon and electron beams in water using cylindrical chambers"],"prefix":"10.1002","volume":"1","author":[{"given":"S. H.","family":"Cho","sequence":"first","affiliation":[{"name":"Department of Radiation Physics The University of Texas M.D. Anderson Cancer Center 1515 Holcombe Boulevard, Box 547 Houston Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. R.","family":"Lowenstein","sequence":"additional","affiliation":[{"name":"Department of Radiation Physics The University of Texas M.D. Anderson Cancer Center 1515 Holcombe Boulevard, Box 547 Houston Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P. A.","family":"Balter","sequence":"additional","affiliation":[{"name":"Department of Radiation Physics The University of Texas M.D. Anderson Cancer Center 1515 Holcombe Boulevard, Box 547 Houston Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N. H.","family":"Wells","sequence":"additional","affiliation":[{"name":"Department of Radiation Physics The University of Texas M.D. Anderson Cancer Center 1515 Holcombe Boulevard, Box 547 Houston Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W. F.","family":"Hanson","sequence":"additional","affiliation":[{"name":"Department of Radiation Physics The University of Texas M.D. Anderson Cancer Center 1515 Holcombe Boulevard, Box 547 Houston Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2000,6]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.598691"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.595446"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.595843"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.596695"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1118\/1.597893"},{"key":"e_1_2_7_6_1","first-page":"319","volume-title":"Teletherapy Physics, Present and Future","author":"Rogers D. W. 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