Download The MARS Code System User`s Guide Version 15(2014)

This table is similar to NEUTRON LEAKAGE SPECTRA PER CM**2 table, but reformatted so
that the columns of data can easily be cut-and-pasted into an external graphics or spreadsheet program.
SPECIAL REGIONS NEUTRON SPECTRA PER CM**2
The “special regions” are user-defined cylindrical volumes specified by the NOBL and RZOB cards
in the MARS.INP file. There can be no more than three of these regions declared, and there is
a column printed for each, filled with zeros if the region is not used. Declaring a NOBL region
triggers the production of HBOOK histograms of a variety of results for the zones within the region;
see Sec 10.1 for a definition of the histograms. This table holds the same data used to fill the
histograms, although as in this case, split into three quantities; each main column for a region holds
three sub-columns labeled NEUTRONS N/UNIT LET N/MEV. The data is given in energy bins as
labeled by the left-most column (note the energy bins are in MeV). The columns of data are arranged
to be easily cut-and-pasted into an external graphics or spreadsheet program. At the end of the table
are three additional results for each special region, summed or accumulated from the spectrum data.
The first result is NEUTRON FLUENCE(N/CM**2); the second result is the mean energy <E>
(GEV); the third result is the dose equivalent NEUTRON DOSE EQIVAL (mSv).
GRAPH: L.E. NEUTRON SPECIAL REGION SPECTRA: dF/d(lnE) (1/cm**2)
This table is similar to the one described above, being data accumulated in the volumes specified
by the NOBL and RZOB cards. The data here is the low energy neutron spectrum dN/dE in units
per GeV-cm2 , plotted in energy bins as labeled by the left-most column. The columns of data are
arranged to be easily cut-and-pasted into an external graphics or spreadsheet program.
GRAPH: LOW ENERGY NEUTRON FLUENCE (N/CM2 PER 1 PPP) AS A FUNCTION OF
DEPTH(DOWN) AND RADIUS(ACROS) IN CM
This table presents data values versus location in the model volume, ignoring zone and region boundaries. The data is instead mapped into 5 r bins and 10 z bins. The maximum r and z bin values
describe the maximum extent of the model - the Standard zone “mother volume”; the bins are created by equal divisions between zero and the maximums. The left-most column gives the mean z
coordinate in each bin; the top two rows give the lower and upper r range for each of those bins. The
data in this table is the low energy neutron flux, in units of neutrons per cm2 per incident primary
particle. The columns of bins and data are arranged to be easily cut-and-pasted into an external
graphics or spreadsheet program.
GRAPH: TOTAL NEUTRON FLUENCE AT E > 1.000E-01 MEV (N/CM2 PER INC. PARTICLE) AS A FUNCTION OF DEPTH(DOWN) AND RADIUS(ACROS) IN CM
This table is similar to the one described above, but for all neutrons below the stated energy cutoff.
GRAPH: NEUTRON FLUENCE AT E > 0.1 MEV (N/CM2 PER INC.PARTICLE) AS A
FUNCTION OF DEPTH(DOWN) AND RADIUS(ACROS) IN CM
This table appears to be identical to the one above.
GRAPH: NEUTRON FLUENCE AT E > 1 MEV (N/CM2 PER INC.PARTICLE) AS A
FUNCTION OF DEPTH(DOWN) AND RADIUS(ACROS) IN CM
This table is similar to the one described above, but for all neutrons below the stated energy cutoff.
GRAPH: NEUTRON FLUENCE AT E > 1.450E+01 MEV (N/CM2 PER INC.PARTICLE)
AS A FUNCTION OF DEPTH(DOWN) AND RADIUS(ACROS) IN CM
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