Beams Document 344-v1

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Preliminary Measurement of Airborne Radioactvity in the MI40 Absorber Room and at MI40 Abort Lambertsons

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Submitted by:
Ruth A. Becker
Updated by:
Monica A Neuffer
Document Created:
07 Apr 1999, 00:00
Contents Revised:
07 Apr 1999, 00:00
Metadata Revised:
07 Apr 1999, 00:00
Actually Revised:
24 Jul 2003, 15:56
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07 Apr 1999, 00:00
Various measurements of airborne radioactivity have been conducted in the MI40 Absorber Room and in the vicinity of the MI40 Lambertsons at the Main Injector (MI). The need for measurements was anticipated during the Main Injector design phase and they were prescribed in an earlier MI NOTE [1]. Airborne radioactivity is produced when particle beams interact with beam line components or enclosure air. The resulting cascade of secondary particles which travel through beam enclosures cause the air to become activated. The isotopes are short-lived positron emitters and are sources of external radiation exposure, primarily annihilation photons. The common, most abundant isotopes found in measurements at Fermilab are C11, N13, Cl38, Cl39, and Ar41.
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