7.10. [ T-DPA ] section

This tally gives the displacement per atom, DPA, value, or number of displaced atoms per target atom, which represents radiation damage in materials irradiated by energetic particles. The result produced by this tally includes the contribution of the Coulomb scattering cross section for charged particle transportation. The DPA for low-energy neutron-induced reactions can also be obtained using e-mode>=1. Note that the sum-over value is not output from [t-dpa].

Table 7.10.1 mesh

value	explanation
reg, r-z, xyz, tet	Mesh type. A mesh type subsection is required below this option.

Table 7.10.2 part

value	explanation
all (default), particle name	Tally particle.

Table 7.10.3 material

value	explanation
(optional)	Specify materials for scoring.
all	all is the default, same as no definition.
number of materials	To set number of materials, define the material numbers in the next line. The number of materials can be set as a negative value, in which case the specified materials are not included for scoring.
(next line)	2 5 8 Material numbers.

Table 7.10.4 unit

value	explanation
1, 2	1: DPA [x1.E-24/source] 2: DPA [1/source]

Table 7.10.5 idpa

value	explanation
(optional, D=0)	0: dpa without athermal recombination correction, NRT-dpa. 1: dpa with athermal recombination correction, arc-dpa.

Table 7.10.6 axis

value	explanation
reg, x, y, z, r	x axis value of output data.
tet	x axis value of output data, only active with mesh=tet.
xy, yz, xz, rz	2-dimensional.

Table 7.10.7 samepage

value	explanation
(optional, D=part)	The type of data to be displayed on the same page of the image output file. Parameters that can be defined in axis can be specified.

Table 7.10.8 file

value	explanation
file name	Define output file names. This is required by each setting of axis.

Table 7.10.9 resfile

value	explanation
(optional, D=file)	Define a file name of the past tally in the restart calculation. Even if several axis parameters were defined, specify only one resfile.

Table 7.10.10 output

value	explanation
dpa	Total DPA value.

Table 7.10.11 mother

value	explanation
(optional)	Specify mother nuclei for contributing to DPA.
all	all is the default, same as no definition.
number of mother nuclei	When setting the number of mother nuclei, define the mothers in the next line. The number of mother can be set as a negative value, in which case the specified mothers are not included for scoring. Note that this parameter is effective only for dose calculations using the kerma approximation for neutrons and photons because energy deposition from charged particles cannot be distinguished to each mother nucleus.
(next line)	208Pb Pb Nucleus if specified using mass. Without mass, all nuclei are isotopes of Pb. To specify multiple mother groups, use multiple [t-dpa] tallies.

Table 7.10.12 factor

value	explanation
(optional, D=1.0)	Normalization factor.

Table 7.10.13 title

value	explanation
(optional)	Title.

Table 7.10.14 angel

value	explanation
(optional)	ANGEL parameters.

Table 7.10.15 sangel

value	explanation
(optional)	Special format for ANGEL parameters.

Table 7.10.16 2d-type

value	explanation
1, 2, 3, 4, 5, 6, 7	Options for 2-dimensional plot.
(optional, D=3)

Table 7.10.17 gshow

value	explanation
0 (default), 1, 2, 3, 4, 5	When mesh=xyz and axis=xy,yz,xz, region border (1), material name (2), region name (3), and LAT number (4) are plotted using this option. gshow=5 outputs only material colors in pixel style when icntl=8.

Table 7.10.18 rshow

value	explanation
0 (default), 1, 2, 3	When mesh=reg,tet and axis=xy,yz,xz, region border (1), material name (2), and region name (3) are plotted using this option. A xyz mesh section must be added below this option.

Table 7.10.19 x-txt

value	explanation
(optional)	\(x\) axis title.

Table 7.10.20 y-txt

value	explanation
(optional)	\(y\) axis title.

Table 7.10.21 z-txt

value	explanation
(optional)	\(z\) axis title.

Table 7.10.22 resol

value	explanation
1 (default)	This option multiplies the region line resolution by a factor of resol with the gshow or rshow option set to define the line thickness.

Table 7.10.23 width

value	explanation
0.5 (default)	The option defines the line thickness.

Table 7.10.24 volume

value	explanation
(optional)	This option defines the volume for each region for reg mesh. Volume definitions are required below this option. Values defined in [volume] are used in the case of no definition. If special description such as using (  ) is used to specify a region in reg=, its internally defined region number is output in input echo when this volume subsection is not defined.
reg vol	Volume definition. For details see the [volume] section.

Table 7.10.25 iechrl

value	explanation
72 (default)	Maximum number of columns for volume input echo.

Table 7.10.26 volmat

value	explanation
(optional, D=9)	This option corrects the volume value for each mesh when material is defined by the xyz mesh. 0 means no correction. Value of volmat is the number of scans per one xyz mesh side.

Table 7.10.27 epsout

value	explanation
0 (default), 1, 2	When epsout=1, results are plotted into eps files. The eps file is named by replacing the extension with .eps. When epsout=2, error bars are also displayed in the eps file, except for the 2-dimensional type, axis=xy, yz, xz, rz.

Table 7.10.28 bmpout

value	explanation
0 (default), 1	Generate Bitmap figure of 2-dimensional tally output. This file is named by replacing the extension with .bmp. When mesh=xyz and axis=xy, yz, xz, it is available.

Table 7.10.29 vtkout

value	explanation
0 (default), 1	Output the tally results in the xyz mesh in the input format of ParaView. This file is named by replacing the extension with .vtk. When mesh=xyz and axis=xy, yz, xz, it is available.

Table 7.10.30 vtkfmt

value	explanation
0 (default), 1	Format of output file for ParaView. 0: ascii, 1: binary.

Table 7.10.31 foamout

value

explanation

0 (default), 1, 2

When foamout=1, generate a file of outputs, numerical data, with OpenFOAM field data format. This file is named by replacing the extension with .foam. When foamout=2, generate a file of outputs, element number, center of mass x coordinate, y coordinate, z coordinate, volume, output data, relative error, with CSV format. This file is named by replacing the extension with .csv. When mesh=tet and axis=tet, it is available.

Table 7.10.32 maxangel

value	explanation
Number of part (default)	Specify the number of part shown in the eps file. This parameter limits the number of particles shown in a tally eps file, while it does not limit them in a numerical data file.

Table 7.10.33 ctmin(i)

value	explanation
(optional, D=-9999)	Minimum value for the i-th counter.

Table 7.10.34 ctmax(i)

value	explanation
(optional, D=9999)	Maximum value for the i-th counter.

Table 7.10.35 chmin(i)

value	explanation
(optional, D=-9999)	Minimum value for the i-th history-counter. This parameter cannot be specified in the batch variance mode, istdev=1.

Table 7.10.36 chmax(i)

value	explanation
(optional, D=9999)	Maximum value for the i-th history-counter. This parameter cannot be specified in the batch variance mode, istdev=1.

Table 7.10.37 trcl

value	explanation
(optional)	Coordinate transformation number or definition for r-z or xyz mesh.

Table 7.10.38 gslat

value	explanation
2 (default)	Option to draw lattice or tetrahedral geometry boundary lines when gshow or rshow is specified.
0	Not drawing.
1	Drawing. Note that the line of voxel phantoms may not be drawn clearly.
2	Not drawing the lines in the same cell.
3	Not drawing the lines in the same material. In this case, the boundary of two adjacent cells filled with the same material is not also drawn, even if not lattice or tetrahedral geometry. When gshow>=3, cell and lattice numbers are now shown.

Table 7.10.39 stdcut

value	explanation
(optional, D=-1)	Threshold value of STD cut off.

When specifying stdcut, PHITS automatically stop the calculation depending on values of STD, standard deviation. This function is available when stdcut is positive and itall=0,1 is set in [parameters] section. When all relative values of STD of the tally result are larger than 0 and smaller than stdcut at the last of one batch, the calculation is stopped. If stdcut in two or more tally sections is set, all the results of the tally sections have to satisfy the conditions in order for the function to work.