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This report estimates the potential for secondary emission processes inducedby ionizing radiation to result in the generation of quasiparticles insuperconducting circuits. These estimates are based on evaluation of datacollected from a small superconducting detector and a fluorescence measurementof typical read-out circuit board materials. Specifically, we study cosmic raymuons interacting with substrate or mechanical support materials present withinthe vicinity of superconducting circuits. We evaluate the potential forsecondary emission, such as scintillation and/or fluorescence, from thesenearby materials to occur at sufficient energy (wavelength) and rate (photonflux) to ultimately lead to the breaking of superconducting Copper pairs (i.e.,production of quasiparticles). This evaluation leads to a conclusion thatmaterial fluorescence in the vicinity of superconducting circuits is apotential contributor to undesirable elevated quasiparticle populations. Aco-design approach evaluating superconducting circuit design and the materialenvironment within the immediate vicinity of the circuit would prove beneficialfor mitigating undesired environmentally-induced influences on superconductingdevice performance, such as in direct detection dark matter sensors or quantumcomputing bits (qubits).

Radiation-induced secondary emissions in solid-state devices as a possible contribution to quasiparticle poisoning of superconducting circuits