A complex association of millimeter-sized, aerodynamically-shaped debris, including glass spherules, glass filaments, and composite-fused melt particles was recovered from beach sands on the shores of the Motoujina Peninsula in Hiroshima Bay, Japan. Based on optical microscopy, this debris comprises six morphological groups ranging from clear glasses to rubber-like constituents. Scanning electron microscopy and synchrotron X-ray microdiffraction revealed dominant aluminum, silicon and calcium (Al-Si-Ca) elemental composition with some iron, mainly in glass, associated with precipitates of mullite and anorthite microcrystals, hematite dendrites and iron-chromium globules, indicative of original temperature conditions >1800 °C. Aerodynamically-shaped fallout debris, including glass spherules described in this study, are generally produced by single high-energy catastrophic events, such as an extraterrestrial body impacting Earth or a nuclear explosion. This study interprets the large volumes of fallout debris generated under extreme temperature conditions as products of the Hiroshima August 6th, 1945 atomic bomb aerial detonation. The chemical composition of the melt debris provides clues to their origin, particularly with regard to city building materials. This study is the first published record and description of fallout resulting from the destruction of an urban environment by atomic bombing.

从日本广岛湾本岛半岛海岸上的沙滩沙子中，发现了复杂的毫米大小，空气动力学形状的碎片，包括玻璃球，玻璃丝和复合熔体。基于光学显微镜，该碎片包括六个形态组，范围从透明玻璃到橡胶状成分。扫描电子显微镜和同步加速器X射线微衍射显示，主要的铝，硅和钙（Al-Si-Ca）元素组成与一些铁，主要存在于玻璃中，与莫来石和钙长石微晶，赤铁矿树枝状晶体和铁铬小球的沉淀有关，指示原始温度条件> 1800°C。空气动力学形状的尘埃碎片，包括本研究中描述的玻璃小球，它们通常是由单一的高能灾难性事件产生的，例如影响地球或核爆炸的地球外物体。这项研究将1945年8月6日广岛原子弹空中爆炸的产物解释为在极端温度条件下产生的大量尘埃碎片。熔体碎片的化学成分为其来源提供了线索，特别是在城市建筑材料方面。这项研究是首次公开发表的记录，并描述了原子弹轰炸破坏了城市环境所导致的后果。1945年原子弹空中爆炸。熔体碎片的化学成分为其来源提供了线索，特别是在城市建筑材料方面。这项研究是首次公开发表的记录，并描述了原子弹轰炸破坏了城市环境所导致的后果。1945年原子弹空中爆炸。熔体碎片的化学成分为其来源提供了线索，特别是在城市建筑材料方面。这项研究是首次公开发表的记录，并描述了原子弹轰炸破坏了城市环境所导致的后果。