Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. 98-Phys-B1 Radiation Physics, National Examination December 2013 — a three-hour open-book examination in which any non-communicating calculator is permitted. The cover page states that all seven questions must be attempted (no choose-N-of-M here) for a total of 100 points, and invites the candidate to submit a written statement of any assumptions made where a question is open to interpretation. This licence is used below in Question 2(c) (the photon-production law assumed for the current change) and Question 5(a) (the numeric value behind the news item's "five times the acceptable exposure" claim).
Reference texts. K. S. Krane, Introductory Nuclear Physics (nuclear masses and binding energy, radioactive decay, fission); F. H. Attix, Introduction to Radiological Physics and Radiation Dosimetry (X-ray production and bremsstrahlung spectra, photon interactions — photoelectric effect, Compton scattering, pair production, gamma detectors); J. R. Cember and T. E. Johnson, Introduction to Health Physics, 5th ed. (dose equivalent, internal dosimetry and effective half-life, shielding, fission-product hazards); J. E. Turner, Atoms, Radiation, and Radiation Protection, 3rd ed. (radiation interactions with matter, health-physics standards).
