Secondary neutron and photon dose in proton therapy.

Background And Purpose: The dose due to secondary neutrons and photons in proton therapy was estimated with Monte Carlo simulations. Three existing facilities treating eye and deep-seated tumours were taken into account. The results of the calculations related to eye proton therapy were verified with measurements.

Disappearance and recovery of catecholamine innervation in brain regions of adult goldfish following 6-hydroxydopamine treatment.

The effect of 6-OHDA treatment on catecholamine innervation was studied in the cerebellum, optic tectum and lobus vagi of the goldfish. Catecholamine terminals completely disappeared in less than two weeks after intraventricular injection of 10 microgram 6-OHDA. In periods comprised between 40 days and 4 months after drug injection, catecholamine terminals reappeared to a different degree.