absorbed dose specific energy imparted specific energy (imparted) attogray attogray centigray centigray decagray decagray decigray decigray exagray exagray femtogray femtogray gigagray gigagray gray gray hectogray hectogray joule per kilogram joule per kilogram 焦耳每千克 kilogray kilogray megagray megagray microgray microgray milligray milligray nanogray nanogray petagray petagray picogray picogray rad rad teragray teragray