Abstract
In connection with comparative measurements on dosimeters used in therapy at various European betatrons the distribution was measured also of the unwanted bremsstrahlung and of fast neutrons. As bremsstrahlung detector use was made of a portable cylindrical ionization chamber. The results show that the distribution of the unwanted bremsstrahlung depends on the construction of the betatron. The measurement of the fast neutrons produced by nuclear photoeffects was carried out on a paraffin double moderator by means of a BF3 counter. In this way it was possible to determine either the neutron dose rate or flux density and so to establish the mean neutron energy. The distribution of the fast neutrons is determined by the shape and dimensions of the therapy room. The measurements thus provide important clues for a suitable construction of therapy rooms. (auth)
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