Fig. 3.

Fractionated irradiation setup. Fractionated irradiation was given to 8 mice simultaneously, no anaesthesia was required. Animals were positioned in the set-up of two rows of opposing plastic tubes with an inner diameter of 2 cm. The snouts were guided through conical holes into the irradiation field (red rectangle). Withdrawal of the animals was prevented by closing the rear ends of the plastic tubes with polystyrene wedges (a). The treatment field encompassed the whole snouts, including the tongues. The rest of the bodies were shielded (b)