Abstract: A radiation beam modulator for modulating a radiation beam in a radiation system, includes an array of multiple columns of a radiation modulating fluid or liquid and a height adjuster which adjusts the heights of the multiple fluid columns so that the adjusted columns collectively will form a target radiation modulating profile. In a first embodiment, the modulator includes a bundle of capillaries in which the modulating fluid is conveyed to form the columns. An antagonizing fluid is conveyed into an opposite end of the capillaries to lock the modulating fluid in position between adjustments. In a second embodiment, the modulator includes a bath of the modulating fluid, in which bars can be immersed and retracted to generate the target radiation modulating profile.

Abstract: A radiation beam modulator (1; 500; 600) that can be employed for modulating a radiation beam (60) in a radiation system. The modulator (1; 500; 600) comprises a bath (590; 690) containing a radiation attenuating fluid (520; 620) and multiple low radiation attenuating bars (570; 670) immersed in the fluid (520; 620) to form an array of multiple columns (525; 625). A height adjuster (530; 630) is arranged for adjusting a respective level of immersion of the bars (570; 670) in the fluid (520; 620) thereby to adjust the heights of the fluid columns (525; 625) such that the columns (525; 625) collectively form a radiation beam modulating profile.

Abstract: The present invention involves a radiation beam modulator (1; 100; 200; 300; 400; 500; 600) that can be employed for modulating a radiation beam (60) in a radiation system. The modulator (1; 100; 200; 300; 400; 500; 600) comprises an array of multiple columns (125; 225; 325; 425; 525; 625) of a radiation modulating fluid or liquid (120; 220; 320; 420) and a height adjuster (130; 230; 330; 430; 530; 630). This height adjuster (130; 230; 330; 430; 530; 630) adjusts the heights of the multiple fluid columns (125; 225; 325; 425; 525; 625) so that the adjusted columns (125; 225; 325; 425; 525; 625) collectively will form a target radiation modulating profile. In a first embodiment, the modulator (100; 200; 300; 400) includes a bundle of capillaries (150; 250; 350; 450) in which the modulating fluid (120; 220; 320; 420) is conveyed to form the columns (125; 225; 325, 425).

Abstract: A flexible control rod for a nuclear reactor is built up of first, second, third and fourth absorber wings which are arranged in a cruciform configuration. Each wing is divided into a number of wing elements by slots extending substantially perpendicularly to the crossing line of the wings. The first and the third wings are arranged in a first plane with the slots in these wings located pairwise in line with each other, and the second and fourth wings are arranged in a second plane and also with their associated slots located pairwise in line. Further, the slots in the first plane are diplaced in parallel in the direction of the crossing line relative to the slots in the second plane, and the portions of the wing elements adjoining the crossing line of the wings are provided with recesses. This arrangement gives good flexibility without undue loss of strength.