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By J. Edgecumbe and E. L. Gxwin


During the past year, a program to study the use of low density KC1 ~!y!lf&?S ' in direct relativistic particle detection systems2 was initiated at the Stanford Linear Accelerator Center. In the course of this study, a contradiction has been noted in data reported earlier by Sternglass and Wachtel,3 (hereafter denoted S and W). They measured an attenuation length, L = (2300 k 600) R, for low energy (- 0- 10 eV) z9,xdary electxr.5:iri bulk density KCl. However, the same authors,4'5 as well tis others, '.L‘<:-port that maximum secondary yield is obtained from bulk dezsity transmiss.iL;,.-"ij:pe dynodes for KC1 thickness, 7, N 700 8; this result, in itself, indicat_:: t1tat L 5 700 8. It has been remarked that, in reflection-tcun25r;; E~s~:::I~ most of the secondaries are created near the end of the pr5zzr-y range., ~2 that the maximum in the secondary yield, 6, versus primary enerp,J, 2 P' curve corresponds to secondaries produced a distance-L below the surfac:, 7 With these assumptions, and using the range-energy rela-i;ionz reported zy Kznter,8 the data of Theodoroug for reflection secondary emission from Kc21 furnish an independent estimate of L. from these data, ' which show a maxi-mum in 6 at E = 1 keV, a value of L ~1 500 a may be czlcula?ed. ( 'The P effects of multiple scattering make this estimate af L an-upper Sound). Work suppcrted by the U. S. Atomic Energy Commissio

Year: 1965
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