The draft for gPREVENTING ACCIDENTAL EXPOSURES FROM NEW EXTERNAL BEAM RADIATION THERAPY TECHNOLOGIESh is well written and contains all essential items on QA/QC problems for new technologies in radiation therapy. Some of items which canft be fulfilled in Japan are included in this draft, but we approve the draft as it is. We have no available data of accidental exposure from new technologies to be added to the draft. Misspelling p15 2.3. Safety culture: line 2 lack of unawareness of signs lack of awareness of signs p89 6.6 Education and training: line 1-2 the error of misunderstanding of field size the error of understanding of field size