A.S. Pradhan , J. Rassow, K. Olthoff-Muenter, W. Baumhoer, P. Meissner
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In-phantom dosimetry using CaF2: Tm (TLD-300) ribbons
Parameters of calibrating CaF2 : Tm for in-phantom dosimetry of therapeutically used fast neutron and 60Co γ-ray beams have been studied. For 60Co γ-ray beams the over-response, outside the main beam and at depths in phantom for large fields of irradiations is significant, and is higher for its 240°C glow peak than for its 150°C peak. The difference in the photon energy dependences of the two peaks of CaF2 : Tm (Zeff = 16.3), which is responsible for the above effect, is discussed. For therapeutically used cyclotron-produced fast neutron beams, the γ-ray absorbed dose component from photons of energy less than 200 keV is negligible.
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