Addendum to MIRD Pamphlet No. 28

Abstract

In the article "Multicenter Evaluation of Frequency and Impact of Activity Infiltration in PET Imaging, Including Microscale Modeling of Skin-Absorbed Dose" by Sunderland et al. (J Nucl Med. 2023;64:1095-1101), the legend in Figure 2A mistakenly states units of MBq, whereas kBq are the correct units. Additionally, the y-axis in Figure 3 should read 0.41 MBq rather than 0.83 MBq. The authors regret the errors.

Development and applications of a computer code for Monte Carlo simulation of electronphoton showers

“…We have also developed a geometry subroutine package, called PENGEOM, which permits working with geometries consisting of a number of homogeneous bodies limited by quadric surfaces. With the aid of PENGEOM, a wide class of practical, real problems can be considered: radiotherapy machine heads (Rogers et al, 1995), human mathematical phantoms (Snyder et al, 1969), radiation detectors, large scale geometries encountered in shielding calculations, etc.…”

“…In simulations of high-energy photon transport, complex geometries can be handled by means of relatively simple methods, which do not require control of interface crossings (see e.g. Snyder et al, 1969). Unfortunately, similar techniques are not applicable to electron and positron transport, mainly because these particles have much shorter track lengths and, hence, the transport process is strongly influenced by inhomogeneities of the medium.…”