Date of Approval 2017/12/12
Approver Takenao Shinohara
Date of Report 2017.12.11

Experimental Report
Project No. 2016A0267

Name of responsible person

Title of experiment
Nondestructive study of traditional Japanese forged iron
artifacts using pulsed neutron imaging for evaluating
crystallographic texture and microstructure and investigating
their manufacturing techniques
Name of principal investigator

Takenao Shinohara
Name of Instrument/ BL No.
BL22
Date of Experiment
06/19/2016 9:00 06/22/2016 9:00

Manako Tanaka
Affiliation
Showa Women's University (The state of the experiment:
Tokyo University of theArts)

Please report your samples, experimental method and results, discussion and conclusions. Please add figures andtables for better explanation.
Name of sample(s) and chemical formula, or compositions including physical form.
(1) Japanese matchlock gun, Fe, solid(2) Fragment of Japanese matchlock gun, Fe, solid(3) Fragment of Japanese sword, Fe, solid(4) Fragment of Japanese sword, Fe, solid(5) Fragment of Japanese sword, Fe, solid

Experimental method and results.

If you failed to conduct experiment as planned, please describe reasons.

Experimental methodWe proposed to carry out the pulsed neutron transmission and neutron tomography experiment at
2016A, but our proposal was regarded as a reserved proposal and our beam time was reduced. So, wedecided to carry out just the neutron tomography experiment at J-PARC/MLF BL22. CCD camera wasused and fragment of Japanese matchlock gun and fragment of Japanese swords samples wereanalyzed by neutron CT. Through our previous pulsed neutron transmission experiment, it's getting
clear that we can get different kind of images by narrowing down the neutron wavelength. From thecould get the image emphasizing the crystal structure information,
whereas from the area after 110 edge, we could get the image emphasizing the impurity. So, in thisexperiment, we decided to narrow down the wavelength using chopper. First we set the wavelength1Experimental method and results (continued)
between 2.8

and 4.2 (Fig.1 A), and then, we changed the wavelength to after 0.5(Fig.1 B).

Results
Because of the beam trouble, we couldn't carry on the experiment after 9 P.M, 06/20/2016. We only
could get two neutron CT data. Fig.2 shows neutron CT image of fragment of Japanese matchlock gun
and that of Japanese sword between 2.8

and 4.2 . Fig.3 shows neutron CT image of fragment ofJapanese matchlock gun and that of Japanese sword after 0.5. Though we narrowed down thewavelength using chopper, there is no big differences between Fig.2 and Fig.3. We checked the image
by taking a difference between Fig,2 and Fig.3 (Fig.4). Now we are still in the middle of checking thedata, but there are some possibilities that the samples had moved during neutron CT experiment, andthe gap image was caused by a differences of the intensity.
.

AB

Fig.1 Neutron spectrum (Bragg edge) ofFe.

Fig.2 Neutron CT image of fragment of Japanese matchlock gun and that of Japanese sword between
2.8and 4.2 .

Fig.3 Neutron CT image of fragment of Japanese matchlock gun and that of Japanese sword after
0.5 .

Fig.4 Neutron CT image by taking difference between Fig.2 and Fig.3.
2