【摘要】 <正> 在加速器中心轴线上距靶1m处,放置标准剂量计空腔电离室,此电离室放在160 mm×150 mm×150 mm的标准有机玻璃模体的最大剂量深度处,用标准次级剂量计进行测量。经激光对中后,在不同重复频率下,重复三次,测得最大吸收剂量率为4.11 Gy/min。更多还原

【Abstract】 The 4 MeV raphytron consists of an X-ray head,a controller,a modulator cabinet,a cooling water cabinet and a motorized positioning system (option). The raphytron 4MeV is capable of producing useful X-ray beams with characteristics usually used in high energy industrial radiography techniques. The major performance of raphytron 4MeV are as follows:Electron beam energy: 4MeV; X-ray dose rete:≥3. 50 Gy/min (on the central axis);X-ray field size: Φ 400 mm(at one meter) ;X-ray focal spot size: Φ 2 mmaX-ray flatness:>70% of the central axis intensity (at: ±7.5° of the central axis ,no X-ray beam filter); X-ray unsymmetry: <±2% (at ±7. 5° of the central axis) ;Detection range:for steel , thickness of 50—250mm ; Radiographic quality : equivalently 1—2T level as defined in ASME E142.更多还原