Radiation survey at the LRL 184-inch cyclotron
In: Nuclear Instruments and Methods, 1962, S. 472-478
Online
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Zugriff:
To predict the radioactivity problems to be anticipated with a high-intensity, Mc 2 accelerator, the residual and induced radioactivities were measured at the 184-Inch Berkeley cyclotron during November 1960. The five-day study included a general survey of radiation levels in the cyclotron vault, short-time activation of foils placed near the cyclotron, and analysis of γ-ray spectra of the cyclotron gap region, including dee structure. Initial radiation levels were less than 8 r/hr; these dropped to about 10 mr/hr after 48 hr. The induced activities in foils were: Cu 64 and Co 58 in copper, Mn 32 , Mn 54 , and Mn 56 in iron; and Na 24 in aluminum. The γ-ray spectra from the gap region show two intense long-lived peaks at 510 and 810 keV, probably from Co 53 . Foils of aluminum, brass, copper, nickel, and steel were then attached to one of the pole pieces and left i n the cyclotron for one year. The γ-ray spectra of these foils were later analyzed for the presence of induced long-lived activities. The foils can be grouped in order of increasing amount of induced activity at saturation bombardment as follows: aluminum, copper, brass, steel, and nickel. The preliminary conclusion is that with proper precautions a 100-μA Mc 2 cyclotron could have a long-lived background less than 1 r/hr.
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Radiation survey at the LRL 184-inch cyclotron
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Autor/in / Beteiligte Person: | Boom, R.W. ; Toth, K.S. ; Zucker, A. |
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Zeitschrift: | Nuclear Instruments and Methods, 1962, S. 472-478 |
Veröffentlichung: | Elsevier BV, 1962 |
Medientyp: | unknown |
ISSN: | 0029-554X (print) |
DOI: | 10.1016/s0029-554x(62)80059-7 |
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