The new method for beam irradiation of extremely low intensity was realized by the acceleration of decay particles from heavy radioactive nuclei. Alpha particles from a ~(241)Am source (3.3 x 10~6 Bq) were accelerated up to 30 MeV with a cyclotron. The weak beam of alpha particles was detected and its energy and microscopic time structure were analyzed. The count rate of the beam extracted from the cyclotron was attenuated down to 5 counts per minute owing to limited acceleration efficiency. Other effective techniques for beam reduction are surveyed and compared. All techniques are capable of observing phenomena induced by single particle irradiation occurring at nano-meter-scale and picosecond time interval.
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机译：通过加速来自重型放射性核的衰变粒子的实现，实现了一种极低强度的束辐照的新方法。用回旋加速器将来自〜（241）Am源（3.3 x 10〜6 Bq）的α粒子加速至30 MeV。检测了α粒子的弱束，并分析了其能量和微观时间结构。由于有限的加速效率，从回旋加速器提取的光束的计数率被衰减至每分钟5个计数。调查和比较了其他有效的减少光束的技术。所有技术都能够观察到由纳米级和皮秒级时间间隔内的单粒子辐照引起的现象。
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