Tatsuhiro Gotanda    Department   Kawasaki University of Medical Welfare  ,    Position   Associate Professor
Language	English
Title	DOSIMETRY USING A RADIOCHROMIC FILM AND A MAMMOGRAPHY PHANTOM
Conference	6th European Congress on Radiation Protection
Promoters	International Radiation Protection Association
Conference Type	International society and overseas society
Presentation Type	Poster notice
Lecture Type	General
Publisher and common publisher	◎Tatsuhiro Gotanda, Yasuyuki Kawaji, Hidetoshi Yatake, Shinya Imai, Takuya Akagawa, Toshizo Katsuda
Date	2022/05/31
Venue (city and name of the country)	Budapest, Hungary
Summary	Mammography is one of the most effective diagnostic methods for the early detection of breast cancer; however, it poses the risk of radiation exposure. To date, mammography dosimetry has been performed according to the mean glandular dose; however, the actual exposure in the breast has not been assessed. We have measured dose distributions and depth doses using both radiochromic films and mammographic phantoms; three-dimensional intra-mammary dose assessment was conducted. The absorbed dose distribution at the surface was markedly higher on the chest-wall side but lower on the nipple side. The absorbed doses in the depth direction exponentially decreased. The glandular tissue near the surface may be irradiated with an absorbed dose of 7.0 mGy or higher. Since EBT3 could be placed inside the phantom, the absorbed dose inside the breast could also be evaluated in three dimensions.