A novel conceptualization in the analysis and design of passive neutron area monitors based on gold foil activation

The thermal column at the TRIGA PUSPATI (RTP) research reactor can produce thermal neutron. However, the optimization on the thermal neutron flux produced should be performed to gain a sufficient thermal neutron for boron neutron capture therapy purpose. Thus, the objective of this review is to optimize the thermal neutron flux by designing the collimator with different materials at the thermal column. In order to fulfil the requirement, set by the IAEA standard, the study of Boron Neutron Capture Therapy (BNCT) around the world was being reviewed to study the suitable measurement, material, design, and modification for BNCT at the thermal column of TRIGA MARK-II, Malaysia. Initially, the BNCT mechanisms and history was review. Then, this paper review on the design and modifications for BNCT purpose around the world. Based on this review, suitable material and design can be used for the BNCT in Malaysia. Moreover, this paper also reviews the current status of BNCT at the RTP with the measurement of the thermal neutron flux was conducted along the thermal column at 250 kW. The thermal column of RTP was divided into 3 phases (Phase 1, Phase 2 and Phase 3) so that an accurate measurement can be obtained by using gold foil activation method. This value was used as a benchmark for the neutron flux produced from the thermal column. The reviewed demonstrated that the final thermal neutron flux produced was significantly for BNCT purpose.

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Estimation of thermal neutron flux in pet cyclotron rooms by means of radioactive analysis of bolts in the rooms

Proceedings in Radiochemistry ◽

10.1524/rcpr.2011.0009 ◽

2011 ◽

Vol 1 (1) ◽

pp. 55-61

Author(s):

Y. Ogata ◽

N. Ishigure ◽

S. Mochizuki ◽

K. Ito ◽

K. Hatano ◽

...

Keyword(s):

Thermal Neutron Flux ◽

Gamma Ray ◽

Gold Foil ◽

Emission Tomography ◽

Neutron Detectors ◽

Positron Emission ◽

Foil Activation ◽

A New Technique ◽

Steel Bolts ◽

Induced Radioactivity

Abstract Short-lived radionuclides for positron emission tomography (PET) examinations in medicine are produced mainly using on site small cyclotrons. The operation of the cyclotron generates a significant quantity of neutrons, which will activate the cyclotron and surrounding materials. A new technique is proposed to estimate the neutron fluxes in the cyclotron rooms, in which small bolts in the cyclotron rooms were used as surrogates for neutron detectors. The measurements were carried out at four PET cyclotrons. The induced radioactivity of the bolts was analyzed by gamma-ray spectroscopy and elemental analysis. A gold foil activation method was applied to compare the results. The neutron fluxes in the PET cyclotron rooms were in the range of 105∼106 cm−2 s−1 during 18F production. In the brass bolts, 69mZn, 65Zn, 64Cu, 58Co, and 60Co were detected. In the iron bolts, 56Mn, 54Mn, 59Fe, 60Co, 69mZn, and 65Zn were detected. In the stainless steel bolts, 58Co, 60Co, 56Mn, 54Mn, and 59Fe were detected. Neutron fluxes estimated from the activities of 56Mn agreed well with those by the Au foil method. The feasibility of estimating the neutron fluxes in cyclotron rooms by means of radioactive analysis of bolts in the rooms was proven.

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Error analysis in reactor-core neutron beam density measurements by gold-foil activation

Soviet Atomic Energy ◽

10.1007/bf01132313 ◽

1986 ◽

Vol 60 (3) ◽

pp. 248-251

Author(s):

Yu. A. Prokof'ev ◽

P. E. Spivak ◽

E. V. Rogov ◽

L. N. Bondarenko

Keyword(s):

Error Analysis ◽

Neutron Beam ◽

Gold Foil ◽

Reactor Core ◽

Density Measurements ◽

Beam Density ◽

Foil Activation

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Neutron measurement at the thermal column of the Malaysian Triga Mark II reactor using gold foil activation method and TLD

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/298/1/012031 ◽

2018 ◽

Vol 298 ◽

pp. 012031 ◽

Cited By ~ 2

Author(s):

Safwan Shalbi ◽

Wan Norhayati Wan Salleh ◽

Faridah Mohamad Idris ◽

Muhammad Aliff Ashraff Rosdi ◽

Muhammad Syahir Sarkawi ◽

...

Keyword(s):

Gold Foil ◽

Activation Method ◽

Neutron Measurement ◽

Thermal Column ◽

Foil Activation ◽

Triga Mark Ii

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Corrections in the gold foil activation method for determination of neutron beam density

Nuclear Instruments and Methods ◽

10.1016/0029-554x(67)90040-7 ◽

1967 ◽

Vol 50 (2) ◽

pp. 191-196 ◽

Cited By ~ 5

Author(s):

J. Als-Nielsen

Keyword(s):

Neutron Beam ◽

Gold Foil ◽

Activation Method ◽

Beam Density ◽

Foil Activation

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Contrast from epitaxially sandwiched macromolecules

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100081991 ◽

1978 ◽

Vol 36 (2) ◽

pp. 226-227

Author(s):

M. Talianker ◽

D.G. Brandon

Keyword(s):

Gold Film ◽

Lattice Defect ◽

Gold Foil ◽

Specimen Preparation ◽

Preparation Technique ◽

Resolution Limit ◽

Transmission Electron ◽

Crystal Lattice Defect ◽

Void Effect ◽

Lattice Resolution

A new specimen preparation technique for visualizing macromolecules by conventional transmission electron microscopy has been developed. In this technique the biopolymer-molecule is embedded in a thin monocrystalline gold foil. Such embedding can be performed in the following way: the biopolymer is deposited on an epitaxially-grown thin single-crystal gold film. The molecule is then occluded by further epitaxial growth. In such an epitaxial sandwich an occluded molecule is expected to behave as a crystal-lattice defect and give rise to contrast in the electron microscope.The resolution of the method should be limited only by the precision with which the epitaxially grown gold reflects the details of the molecular structure and, in favorable cases, can approach the lattice resolution limit.In order to estimate the strength of the contrast due to the void-effect arising from occlusion of the DNA-molecule in a gold crystal some calculations were performed.

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