Figure 6-5.jpg High-LET radiation effects on operant response. This figure shows the relationship between the exposure to different energies of 56Fe and 28Si particles and the threshold dose for the disruption of performance on a food-reinforced operant response. Only a single energy of 48Ti particles was tested. The threshold dose (cGy) for the disruption of the response is plotted against particle LET (keV/μm) (Rabin et al., 2007).
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]