ERRATA CORRIDGE --- Chapter 1 --- ******************************* Problem 1.52 Eq. 1.281 0.9 x 10^{18} eV ===> 0.9 x 10^{20} eV Eq. 1.283 2 x 10^{-19} rad ===> 2 x 10^{-11} rad Eq. 1.284 assumes that all photons move against the incoming proton: in reality, one should account for the fact that the photons are distributed according to Planck's law of black bodies and integrate over all photon angles and energies such that the threshold condition of Eq. 1.281 is met. The result here obtained is to be taken as an order-of-magnitude estimate. *******************************