A detailed discussion of penetration and diffusion problems for all ionizing radiations is being prepared by Bureau scientists for the Encyclopedia of Physics (Handbuch der Physik) edited by FluggeS., Springer-Verlag, 1955. The state of research on gamma-ray penetration and diffusion through mid-1953 is summarized in Gamma-ray attenuation by U. Fano, Nucleonics 11, 8 and 9 (Aug. and Sept. 1955).
2.
Penetration and diffusion of X-rays: Calculation of spatial distribution by polynomial expansion, by SpencerL. V. and FanoU., J. Research Nat. Bur. Standards46, 446 (1951) RP 2213.
3.
Penetration of X- and gamma rays to extremely great depths, by FanoU., J. Research Nat. Bur. Standards51, 95 (1953) RP 2439.
4.
Reflection and transmission of gamma radiation by barriers: Monte Carlo calculation by a collision-density method, by BergerM. J., J. Research Nat. Bur. Standards55, 343 (1955) RP 2640; Reflections and transmission of gamma radiation by barriers: Semianalytic Monte Carlo calculation, by BergerM. J. and DogettJ., J. Research Nat. Bur. Standards56, 89 (1956) RP 2653. A more specific application of Monte Carlo methods is contained in “Response function of thallium-activated sodium-iodide scintillation counters,” by BergerM. J. and DoggettJ., J. Research Nat. Bur. Standards56, 355 (1956) RP 2686.
5.
Penetration and diffusion of X-rays: Calculation of spatial distribution by semi-asymptotic methods, by SpencerL. V., Phys. Rev.88, 793 (1952).
