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用高能直线加速器的电子束治疗蕈样霉菌病等全身性皮肤疾病,通常使用2-4M瓦电子束。若在不到九十天内,骨髓吸收了100cGy～460cGy的X射线,就容易引起骨髓抑制。因此,必须将单次照射的X线污染减到1％以下。 ZJ-10(4)直线加速器的6M瓦电子束,在SSD=400cm处,射野中心轴内9cm处的X污染超过6.0％作者使用1cm厚的铝锥形筒及0.5cm厚有机玻璃锥形筒插入机头内,减少了由钨门产生的轫致辐射,并减少有机玻璃板的厚度,使单次照射野的X线污染从6.0％减到
Treatment of systemic skin diseases such as mycosis fungoides by electron beams of high-energy linacs typically uses 2-4M watts of electron beam. In less than 90 days, bone marrow absorption of 100cGy ~ 460cGy of X-rays, it is easy to cause bone marrow suppression. Therefore, it is necessary to reduce the single-shot X-ray pollution to less than 1%. ZJ-10 (4) X-ray pollution of 6 MW at a linear accelerator at X = 9 cm within 9 cm of the center axis at SSD = 400 cm The author used a 1 cm thick aluminum conical tube and a 0.5 cm thick plexiglass cone The tube is inserted into the handpiece to reduce the bremsstrahlung generated by the tungsten door and to reduce the thickness of the plexiglass plate so as to reduce the X-ray pollution of the single irradiation field from 6.0%