An increase in tube potential would increase image receptor exposure by increasing the:

An increase in tube potential refers to a higher kilovolt peak (kVp) setting on the radiographic equipment. When the tube potential increases, the energy of the photons generated in the x-ray tube also increases. This leads to an increase in the number of high-energy photons that reach the image receptor. As a result, more photons are available to contribute to the exposure of the image receptor, enhancing the overall image intensity.

Furthermore, the higher energy photons produced at increased tube potentials are less likely to be absorbed or scattered within the body tissues, facilitating a more efficient transfer of x-ray energy to the image receptor. This increased photon production directly correlates with the exposure levels recorded in the image, contributing to improved image quality and diagnostic visibility, especially in denser anatomical areas.

While the penetrating ability of the beam is certainly affected by changes in tube potential, the direct increase in the number of photons impacting exposure is the most pertinent factor in this context. Therefore, the correct response accurately captures the relationship between tube potential and image receptor exposure.