Stanza Radiografie e Fluoroscopie-Barriere secondarie in piombo

Figure excerpt from NCRP Report No. 147, Structural Shielding Design for Medical X-Ray Imaging Facilities

63- ReF lead sec

Fig. 4.7c. The lead thickness requirements for secondary barriers in the representative R&F room shown as a function of NT/Pd2. P is in milligray per week, N is the weekly total number of patients examined in the R&F room, and d (in meters) is chosen as the distance from the most intense radiation source to the occupied area. If the Wnorm values given in Table 4.5 do not match the per patient workload for the facility under consideration, then the original value of NT/Pd2 can be multiplied by Wsite / Wnorm, and the modified value can be used to obtain the required shielding from Figure 4.7c.