Bettega D, Birattari C, Candoni B, Coppola M, Poli A, Sverzellati P P, Lombardi L T
Radiat Environ Biophys. 1981;19(2):79-89. doi: 10.1007/BF01324224.
The frequency distributions of energy deposition in microscopic volumes for proton beams of various energies and energy spreads were determined by means of a "rossi type" proportional counter. Tissue equivalent spherical volumes of 0.6, 0.72, 0.80, 1.00, 1.25, 1.50, 1.75, 2.00 micrometer diameter were simulated. Frequency distributions of energy deposition per unit pathlength are reported and their behavior as a function of the simulated pathlength, beam energy and energy spread is discussed. The results indicate that energy deposition distributions in microscopic volumes for protons in the range 8-31 MeV are skewsymmetric distributions with a tail on the high energy side, and that degraded beams behave differently from monoenergetic ones. Dose mean lineal energy values have been quoted for beams used in radiobiological experiments.
利用“罗西型”正比计数器确定了不同能量和能量展宽的质子束在微观体积内的能量沉积频率分布。模拟了直径为0.6、0.72、0.80、1.00、1.25、1.50、1.75、2.00微米的组织等效球体积。报告了单位路径长度的能量沉积频率分布，并讨论了其作为模拟路径长度、束流能量和能量展宽的函数的行为。结果表明，8-31MeV范围内质子在微观体积内的能量沉积分布是高能侧有尾巴的偏对称分布，并且降解束的行为与单能束不同。文中引用了放射生物学实验中使用的束流的剂量平均线能量值。
