such as The House in the Middle and others, focused on the combustion of fabrics and clothing. In the only human accounts at these high luminous intensities that are not of the more common Arc flash accidents, a number of the Hiroshima Maidens survived despite their close proximity to the explosion and in a range where the flash-fire of their customary Japanese summer attire, made of thin kimono cloth, was near instantaneous. As their clothing combusted, some of the Maidens performed an incomplete stop, drop and roll in an effort to extinguish the flames. Initial nuclear radiation While not designed for those faced with low-yield neutron bombs or for those who are, in general, so close to the nuclear fireball that prompt/initial radiation would be life-threatening in the short-medium term, ducking and covering would nevertheless slightly reduce exposure to the initial gamma rays, specifically the portion emitted after the first flash of visible light. The initial gamma rays are defined as those emitted from the fireball & following mushroom cloud which can reach personnel on the ground for a total of approximately 1 minute, at which point the intensity of the radiation has diminished and the atmosphere itself is thick enough to act as full shielding. As approximately half of these gamma rays are emitted in the first second and the other half, over the following 59 alongside gamma rays being mostly emitted in a straight line, people lying on the ground will more likely have obstacles serving as radiation protection such as building walls, foundations, car engines, etc. between their bodies and the radiation emitted from both the fireball and the accompanying lower levels of radiation that continue to arrive at the ground for about 1 minute, during the mushroom cloud phase, which is termed "cloudshine". It would also give protection from the even smaller fraction of radiation that changes direction and is randomly reflected and scattered by the air/"skyshine". Approximately "One and one half inches"/37 mm of steel will reduce gamma dose by half. Its half-value thickness. The effective gamma ray energy of the cloudshine is not especially high, 200 KeV. Unlike the relatively low-yield, or low explosive energy "A-bombs" dropped on Hiroshima and Nagasaki, which did result in a sizable proportion of injuries from prompt radiation, higher yield "hydrogen bombs" (thermonuclear weapons) are not expected to result in very many such injuries – as the range at