Residual activation of thin accelerator components Page: 1 of 15
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Fermilab FERMILAB-FN-0788-AD May 2006
Residual Activation of Thin Accelerator
Components*
N.V. Mokhov, E.I. Rakhno**, I.L. Rakhno
Fermilab, P.O. Box 500, Batavia, Illinois 60510
**North Central College, 30 North Brainard St., Naperville, Illinois 60540
May 18, 2006
Abstract
A method to calculate residual activation of thin accelerator components is pre-
sented. A model for residual dose estimation for thick objects made of arbitrary com-
posite materials for arbitrary irradiation and cooling times is employed in this study.
A scaling procedure is described to apply the model to thin objects with linear di-
mensions less than a fraction of a nuclear interaction length. The scaling has been
performed for various materials and corresponding factors have been determined for
objects of certain shapes (slab, solid and hollow cylinder) which are important from
practical standpoint and can serve as models for beam pipes, magnets and collimators.
Both contact residual dose and dose attenuation in air outside the objects were consid-
ered. A comparison between calculations and measurements performed at the Fermi
National Accelerator Laboratory using a 120 GeV proton beam is presented.
1 Introduction
Induced activation of accelerator components is an important issue from practical stand-
point. After an accelerator shutdown or during normal operation various beam line com-
ponents like collimators, magnets, beam pipes, windows and so forth reveal high induced
activation. Handling and maintenance of such components can be extremely difficult and,
therefore, correct prediction of their residual activity is of primary importance when plan-
ning on various hands-on and maintenance procedures.
Nowadays the most complete and correct procedure to predict residual activation of an
object is the following: (i) calculation of residual nuclei distribution with a Monte Carlo
code for a given irradiation scenario; (ii) determination of a y-ray source using the ob-
tained distribution and nuclear data on the decay chains and nuclear transmutation from
*Work supported by the Universities Research Association, Inc., under contract DE-AC02-76CH03000
with the U. S. Department of Energy.1
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Mokhov, N. V.; Rakhno, E. I. & Rakhno, I. L. Residual activation of thin accelerator components, report, May 1, 2006; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc883449/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.