A measurement of the radiation environment in the CDF tracking volume

We present direct measurements of the spatial distribution of charged particle and photon radiation and radiation from low energy neutrons (En<200 keV) inside the tracking volume of the Collider Detector at Fermilab (CDF). Two types of thermal luminescent dosimeters are used for these measurements. Data collected from exposures with different accelerator conditions allow us to separate the radiation fields into contributions from proton beam losses and from proton–antiproton collisions. Using a simple model of a power law in 1/r, where r is the distance from the beam axis, we find the power depends on the distance from the interaction point along the beam axis with the range 1.5–2.0. Predictions based on this model show good qualitative agreement with initial measurements of the leakage currents in the low radius silicon detectors.