Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974 Page: 45 of 53
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E. Application of the Beta Attenuation Technique for the Determina-
tion of Cyclotron Tarnet Thickness
The use of thin targets in recoil distance measurements necessitates
an accurate method for accurately determining target thicknesses as thin
as 10 vsm /cm2. The attenuation of electrons emitted from a low energy
beta source has been previously suggested for this purpose but in not widely
used.2-24 Our experience with the beta attenuation technique for atmos-
pheric aerosol mass measurement (see Part IV of the report) indicated that
a simple inexpensive beta attenuation device could be constructed for deter-
mining thin cyclotron target thickness. We have built a prototype beta
attenuation scauaer employing a C beta source and silicon surface barrier
detector coupled to fast low-noise nuclear electronics. We are now testing
this device with targets made of various elements.
(E. S. Macias, R. Goldworm and L. 1. Rutledge)
F. Calibrations of Ge(Li) and Si(L) Detectors
Recent advances in the spectroscopy of x rays and low energy gamma
rays have been in part due to the increased quality of commercially avail-
able semiconductor spectrometers. Use of these detectors requires careful
calibration of absolute efficiency and silicon escape peak efficiency.
These calibrations are described below.
1. X-ray detector efficiency determinations
The efficiency calibration of a detector for energies less than 100
keV requires standards for which the relative intensity of both y rays and
x rays are well known. This necessitates accurate values for fluorescence
22. J.H. Peterson and &R. Downing, J. Opt. Soc. Am. 41, 862 (1951).
23. B.D. Pate and L. Yaffe, Can. J. Chem. 33, 15 (1955).
24. O.U. Anders and W.A. Meinke, Rev. Sac. Inst 27, 416 (1956).
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Macias, E. S. Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974, report, January 1, 1974; St. Louis, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc1020885/m1/45/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.