Collimator design for neutron radiography station using Monte Carlo simulation

Wonglee, S.; Liamsuwan, T.; Pornroongruengchok, W.; Channuie, J.; Picha, R.; Khaweerat, S.

doi:10.1088/1742-6596/1144/1/012095

Cited by 5 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous study [11], the extended collimator was installed directly after the shutter to reduce beam scattering as well as lowering radiation dose around the imaging room. The 𝐿/𝐷 ratio was, in principle, calculated from the geometric drawing from the in-wall collimator through the shutter and the extended collimator.…”

Section: Neutron Beamsmentioning

confidence: 99%

Determination of neutron image quality of compact collimator facility for non-destructive testing

Chulapakorn¹,

Wonglee²,

Pornroongruengchok³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

Neutron imaging, based on a digital-based detector system, was developed for non-destructive internal inspection at the Thai Research Reactor-1/Modification 1 (TRR-1/M1). Neutron activation analysis was employed to determine thermal-neutron flux at the imaging position. The facility provided flux of thermal neutrons at 2.5× 105 cm−2s−1. Several standard samples were used to evaluate the collimation ratio (L/D), resolution, and unsharpness for the current setup of neutron imaging. An analytical method was employed to determine image quality parameters to moderate neutron flux. The L/D ratio depends on the aperture size of the divergent collimator and can be amended by using appropriate sample shape, resulting in more accurate estimate of collimation parameters. Resolution and unsharpness for neutron tomography were 0.5 mm and 1 mm, respectively. Results suggested the possibility of evaluating image quality using samples with non-complex structure.

show abstract

Section: Neutron Beamsmentioning

confidence: 99%

Determination of neutron image quality of compact collimator facility for non-destructive testing

Chulapakorn¹,

Wonglee²,

Pornroongruengchok³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

show abstract

“…In addition, the first tomography was successfully set up and run in the same year along with a digital camera and simple rotation handling. In 2018, the extended collimator was designed and installed to reduce radiation scattering [3]. In recent years, the NIF has been continually operated and developed with an operating power of 1 MW thermal flux at the sample position of 10 5 n/cm 2 •s.…”

Section: Introductionmentioning

confidence: 99%

Upgrading Neutron Imaging Facility at TRR-1/M1 Reactor

Pornroongruengchok,

Wonglee,

Kotayee

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The neutron imaging system at Thai Research Reactor 1/Modification 1 (TRR-1/M1) is located at Thailand Institute of Nuclear Technology, Bangkok. It has been developed for research on non-destructive investigation using radiography and tomography techniques. The main instruments of the system consist of a neutron camera, a sample rotation system operated by in-house developed software, and a neutron shutter remotely controlled via a WIFI switch. In the first half of 2022, the TRR-1/M1 was temporarily shut down for annual maintenance. Meanwhile, additional shielding was installed in the imaging room for improving radiation safety. The current neutron camera was replaced with a new one to improve the imaging system performance. The camera performance, such as brightness and image quality, were investigated by varying the exposure time and imaging of the resolution test pattern, Siemens star, respectively. The results showed that the new camera set has higher brightness than the old one about 41% when compared to 70% grey value of 16 bit-format. The spatial resolution of 2D and 3D images were 0.59 mm and 1.37 mm, respectively. Moreover, the additional shields could reduce the radiation level around the reactor hall about 6-7 times. Then, neutron tomography using a new camera will be conducted to present the 3D visualization of various samples.

show abstract

Preliminary study of neutron tomography performance tested by a standard specimen

Wonglee¹,

Pornrungruengchok²,

Chulapakorn³

et al. 2019

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The performance of neutron tomography facility at the Thai Research Reactor TRR-1/M1 is studied. Thermal neutron beams with a flux of 106 n/cm2/s are employed to radiate on a standard sample, so-called Strip B, in the test. The neutron irradiating on samples were detected by a neutron-to-photon conversion plate. After that, the low-energy photons were guided to a charge coupled device (CCD) to obtain a digital image. During the experiment, a rotation stage was used to rotate the sample in order to measure the attenuated/scatted neutrons at different angles with respect to the sample geometry. The angle-varied images were then processed via a reconstruction software to create a 3-dimension (3D) image (tomography). The result shows that an image of 0.5 mm-diameter cadmium wire could be observed by employing our facility, but the sharpness of the 3D image is still needed to be further improved.

show abstract

Collimator design for neutron radiography station using Monte Carlo simulation

Cited by 5 publications

References 1 publication

Determination of neutron image quality of compact collimator facility for non-destructive testing

Determination of neutron image quality of compact collimator facility for non-destructive testing

Upgrading Neutron Imaging Facility at TRR-1/M1 Reactor

Preliminary study of neutron tomography performance tested by a standard specimen

Contact Info

Product

Resources

About