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MO‐B‐BRA‐01: Practical Examples, Including IMRT, TBI, SRS
Author(s) -
Rodgers J
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2761202
Subject(s) - electromagnetic shielding , medical physics , radiation protection , dosimetry , vault (architecture) , constraint (computer aided design) , computer science , nuclear medicine , medicine , engineering , mechanical engineering , electrical engineering , structural engineering
NCRP Report No. 151(December 2005), titled “Structural Shielding Design and Evaluation for Megavoltage X‐ and Gamma‐Ray Radiotherapy Facilities”, presents updated methods and data for radiation therapy room shielding design. These calculation methods are applied in examples representing the more common shielding design situations. A radiation therapy vault with a maze barrier and intended for use with IMRT and TBI procedures is the principal example. Detailed calculations of the barriers and door shielding structures are presented. Procedures for evaluating compliance with the NRC licensing constraint on dose equivalent in‐any‐one‐hour are presented. An example of a high‐energy room where photoneutron production is of concern is presented with focus on assessing the dose equivalent at the entrance and the maze door design. Objectives: Learn by worked examples (1) how to apply the methods and data presented in NCRP 151 for designing high energy therapy vault barriers; (2) how to determine prospectively if the barrier design is adequate to satisfy the public areas “2 mrem in‐any‐one‐hour” constraint when it is applicable.