Lead shielding thickness for dose reduction of 7- to 28-MeV electrons

Journal Article · Sat Nov 01 04:00:00 EST 1975 · Med. Phys., v. 2, no. 6, pp. 336-337

DOI:https://doi.org/10.1118/1.594205· OSTI ID:4131369

Giarratano, J C; Duerkes, R J; Almond, P R

The relative percent dose reduction by lead of 7- to 18-MeV electrons with a Siemens betatron and of 19- to 28-MeV electrons with a Sagittaire linear accelerator has been measured with a thin-wall buildup chamber for 6.3 x 6.3- and 10.5 x 10.5-cm field sizes at the chamber position for the normal treatment source-to-skin distance (SSD) of each machine. The thickness of lead necessary to attenuate the open beam by 95--98% was then determined of 7- to 28-MeV electrons. The required thickness of lead to attenuate 95% of the 7- to 28-MeV electron beam ranged from 2.3 to 18 mm for the 6.3 x 6.3-cm field and from 2.4 to 23 mm for the 10.5 x 10.5-cm field, respectively. For 98% attenuation, thicknesses from 2.6 to 25.0 mm for the 6.3 x 6.3-cm field and from 2.8 to 27.5 mm of lead for the 10.5 x 10.5-cm field were necessary. (AIP)

• Research Organization: The University of Texas System Cancer Center, M. D. Anderson Hospital and Tumor Institute, Houston, Texas 77025
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-011090
• OSTI ID: 4131369
• Journal Information: Med. Phys., v. 2, no. 6, pp. 336-337, Journal Name: Med. Phys., v. 2, no. 6, pp. 336-337; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

*ELECTRON BEAMS-- SHIELDING
*LEAD-- CHARGED-PARTICLE TRANSPORT
643602*
MEV RANGE 10-100
N72400* --Physics (Radiation & Shielding)--Shielding Calculations & Experiments
RADIATION DOSES
RADIATION MONITORING
RADIOTHERAPY
THICKNESS