A range shifter comprises transmission plate (1) with its thickness adjusted in response to a given value of attenuation of energy, and holding portion (3) for holdingtransmission plate (1), the thickness of transmission plate (1) is adjusted to a thickness corresponding to an attenuation less than the given value in a given percentage, and an overlapping mechanism is disposed upon at least one of transmission plate (1) and holding portion (3) for detachably overlapping adjust sheet (2) upon transmission plate (1), in which the thickness of adjust sheet (2) was adjusted to be under a thickness corresponding to a doubled attenuation of the given percentage.本發明之射程移位器係包含:穿透板(1),係因應能量的衰減量的設定值而調整其厚度;以及保持部(3),係保持穿透板(1);且穿透板(1)之厚度係調整為相當於比設定值還要小預定比例的衰減量之厚度,並且穿透板(1)及保持部(3)中之至少一方係設置有重疊機構,係使將厚度調整為相當於預定比例的二倍的衰減量之厚度以下之調整板(2)可自由拆裝地重疊於穿透板(1)。理由:須用整個圖式[第1圖(a)及(b)]才能顯示完整技術特徵。1‧‧‧穿透板2‧‧‧調整板3‧‧‧框架4-1‧‧‧穿透單元4-i‧‧‧穿透單元6‧‧‧螺絲6a‧‧‧螺絲6b‧‧‧螺絲6c‧‧‧螺絲10‧‧‧射程移位器11‧‧‧箱體12‧‧‧汽缸31‧‧‧固定框架32‧‧‧夾持框架33‧‧‧中間框架34‧‧‧分隔器
