@misc{oai:repo.qst.go.jp:00071504,
 author = {Mizuno, Hideyuki and Yamashita, Wataru and Takase, Nobuhiro and Sakata, Suho and Fukahori, Mai and Fukumura, Akifumi and 水野 秀之 and 山下 航 and 高瀬 信宏 and 佐方 周防 and 深堀 麻衣 and 福村 明史},
 month = {Sep},
 note = {Purpose
 In Japan, postal dose audits have been performed on the radiation therapy units using a radiophotoluminescent glass dosimeter (RGD) since 2007. In 2010, the audit for the non-reference condition including field size change or wedge insertion was initiated. This study summarizes the latest results of non-reference condition.
Methods
 Through these 4 years, 458 beams have been measured for different field size from 5 x 5 cm2 to 25 x 25 cm2 and 301 beams have been measured for different wedge angle from 15 to 60 degrees.
Results
 For the beams with the field size change, the mean differences of measured from stated dose at each field size, 5 x 5 (n = 197), 15 x 15 (n = 55), 20 x 20 (n = 173), and 25 x 25 (n =33) cm2, were -0.3%, 0.3%, 0.4%, and 0.2% respectively. The standard deviations of the distribution at each field size were 1.0%, 1.0%, 1.2%, and 1.5% respectively. For the wedged beam irradiation, the mean of the differences of measured from stated dose with each wedge angles, 15° (n = 112), 30° (n = 102), 45° (n = 45), and 60° (n = 42), were 0.1%, 0.1%, 0.1%, and 0.3% respectively. The standard deviations of the distribution at each wedged angle were 1.0%, 1.3%, 1.2%, and 1.3% respectively. 
Conclusion
 The postal dose audit using RGD to non-reference condition has been successfully performed. The mean differences of measured from stated dose were within 0.5% for every field size and wedge angle., The 7th Korea-Japan Joint Meeting on Medical Physics},
 title = {Recent results of a postal dose audit for radiotherapy machine in Japan with non-reference condition},
 year = {2014}
}