  Radioactivity was recently discovered as a source of decoherence and
correlated errors for the real-world implementation of superconducting quantum
processors. In this work, we measure levels of radioactivity present in a
typical laboratory environment (from muons, neutrons, and gamma's emitted by
naturally occurring radioactive isotopes) and in the most commonly used
materials for the assembly and operation of state-of-the-art superconducting
qubits. We develop a GEANT-4 based simulation to predict the rate of impacts
and the amount of energy released in a qubit chip from each of the mentioned
sources. We finally propose mitigation strategies for the operation of
next-generation qubits in a radio-pure environment.
