文档介绍：6 Radiation Protection Design and Shielding of
Diagnostic X-ray Facilities
Douglas J. Simpkin
St. Luke's Medical Center
Benjamin R. Archer
Baylor College of Medicine
Robert L. Dixon
Bowman Gray School of Medicine of Wake Forest University
Introduction ......................................... 319
Basic Concepts ....................................... 321
New Design Dose Limits ............................... 326
. New Data for Shielding ................................ 328
Workload and Workload Distribution .................... 328
. Use Factors ......................................... 331
Occupancy Factors .................................... 332
Pre-shielding of the Primary Beam by the Image Receptor
and Supports ........................................ 334
Transmission Data .................................... 336
Primary Barriers ..................................... 348
of Primary Barrier Thickness ................ 348
Example Calculation for Primary Barriers; Floor of a
Radiographic Room Under the Radiographic Table ......... 351
Secondary Barriers ................................... 354
Secondary Radiation .................................. 354
Scatter Radiation ..................................... 355
Leakage Radiation ................................... 357
The Total Secondary Barrier and Secondary Transmission .... 358
Example Calculation for Secondary Barriers;
Cardiac Angiography Laboratory ........................ 369
A General Radiation Barrier ........................... 369
Overview ........................................... 369
Example Calculations for a Radiographic Room ............ 370
318 6 Radiation Protection Design and Shielding of Diagnostic X-ray Facilities
Secondary Barrier Calculation for the Floor
of a Radiographic Room ............................... 371
Secondary