Neutron Spectrum from Fast Reactor Page: 3
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2-7 Mev a one mg/cm (l
tv) radiator wftt used and for the
region 6-16 Mev • 20 mg/cm radiator (l. 9 Mtv at 6 Mev) was utilised.
It was furthermore found desirable to use an aluminum absorber in
front of tome of the photographic plate* which were used in conjunction
with the 20 Mg/cm^ radiator. Thia wat done in order to eliminate the
low energy protons for the exposures which were made in order to
determine the high energy portion of the spectrum For each of the
exposures made the fast reactor was run for an accurately determined
number of watt hours (approximately 2 hours at 50 watts).
Both 100 p and 200 p Ilford C-2 plates were exposed in this
experiment, the thick emulsions being used to determine the high energy
portion of the spectrum where the proton recoils have long ranges
(a 14 Mev proton has a range of 1000 p). The plates were analysed by
determining, for a gven area of each plate, the range distribution of
tracks, above some arbitrary range established by the particular
radiator thickness used, entering the aurface of the emulsion and proceed-
ing In the proper direction at fixed by the radiator-detector geometry.
In the cate of short tracks, an eyepiece scale was used to make the
length determinations while in the case of long tracks both a dial,
indicator and the microscope stage vernier were utilised, the latter
serving at merely a rough check on the former. Since only the projec-
tion of each track was measured, a small correction (**2%) was
applied to the measured length of each track in order to convert it to
an absolute range. An additional correction was then applied to each
absolute range in order to compensate for finite radiator thickness.
Thiu was done by simply adding to each absolute range the emulsion
equivalent of 1/2 the radiator thickness. This correction was reflected
as a correction to the deduced energy of approximately 6% in the region
0.4 to 5 Mtv, 10% in the region 5 to 11 Mev and 3% in the region above
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Rosen, Louis. Neutron Spectrum from Fast Reactor, report, 1957; [Oak Ridge, Tennessee]. (https://digital.library.unt.edu/ark:/67531/metadc173260/m1/4/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.