作者将6Mev 直线加速器与~(60)钴机从以下五个方面作一比较即:(1)单野的深度量分布。(2)相对野的均匀度观察。(3)旋转治疗中的适用性。(四)大野的适用性。(五)机器设备及其经济价值。1.作者说明第一第二点用的对比条件如焦皮距均为100平方厘米时而大部分的~(60)钴机其 SSD 均小于100厘米,由于~(60)钴在经济上很难制作一种较高的放射比度钴源,因此它的深度量分布必然受到 The author compares the 6Mev linac and the ~(60) cobalt machine from the following five aspects: (1) Single field depth distribution. (2) Observation of the uniformity of the relative field. (3) Applicability in rotary therapy. (d) Ono’s applicability. (e) Machinery and equipment and their economic value. 1. The authors stated that the first and second points used contrast conditions such as the focal length of 100 square centimeters and most of the 60 cobalt machines had SSDs less than 100 centimeters, because ~(60)cobalt is economically difficult A higher source of cobalt with a specific emission ratio is produced, so its depth distribution must be