Ihnen E, Jensen J M
Strahlentherapie. 1982 Jan;158(1):30-3.
Measurements of the activity of urea are a simple and reproducible method to determine the activation of air produced by the continuous radiation of a medically used accelerator [3,4]. The authors studied the activity produced by photonuclear induction using a 42 MeV betatron under unfavorable irradiation conditions. The activity measured per individual irradiation is 1.56 x 10(5) Bq 13N and 4.93 x 10(5) Bq 15O. The limit values indicated in the Radioprotection Regulation are not reached if an intensive air exchange and a waiting-time between the end of the irradiation and the entering of the irradiation room is guaranteed.
测量尿素活性是一种简单且可重复的方法，用于确定医用加速器连续辐射产生的空气活化情况[3,4]。作者研究了在不利辐照条件下，使用42兆电子伏电子感应加速器通过光核感应产生的活性。每次单独辐照测量的活性为1.56×10⁵贝克勒尔的¹³N和4.93×10⁵贝克勒尔的¹⁵O。如果保证有强烈的空气交换以及在辐照结束与进入辐照室之间有等待时间，那么就不会达到辐射防护法规中规定的限值。
