FIRST IMAGES FROM THE CRIPT MUON TOMOGRAPHY SYSTEM

2014 ◽  
Vol 27 ◽  
pp. 1460129 ◽  
Author(s):  
J. ARMITAGE ◽  
J. BOTTE ◽  
K. BOUDJEMLINE ◽  
A. ERLANDSON ◽  
A. ROBICHAUD ◽  
...  
Keyword(s):  
Scintillation Counter ◽  
Cosmic Ray ◽  
Target Volume ◽  
Nuclear Materials ◽  
Tomography System ◽  
Intrinsic Resolution ◽  
Muon Tomography ◽  
Passive Tomography ◽  
Shipping Containers

The CRIPT Cosmic Ray Imaging and Passive Tomography system began data taking in September 2012. CRIPT is a “proof of principle” muon tomography system originally proposed to inspect cargo in shipping containers and to determine the presence of special nuclear materials. CRIPT uses 4 layers of 2 m x 2 m scintillation counter trackers, each layer measuring two coordinates. Two layers are used to track the incoming muon and two for the outgoing muon allowing the trajectories of the muon to be determined. The target volume is divided into voxels, and a Point of Closest Approach algorithm is used to determine the number of scattering events in each voxel, producing a 3D image. The system has been tested with various targets of depleted uranium, lead bricks, and tungsten rods. Data on the positional resolution has been taken and the intrinsic resolution is unfolded with the help of a simulation using GEANT4. The next steps include incorporation of data from the spectrometer section, which will assist in determining the muon's momentum and improve the determination of the density of the target.

Muon Tomography for Measuring Amount of Nuclear Materials in Fuel Debris

2018 ◽  
Author(s):  
Tsukasa Sugita ◽  
Haruo Miyadera ◽  
Kenichi Yoshioka ◽  
Naoto Kume
Keyword(s):  
Nuclear Power ◽  
Cosmic Ray ◽  
Nuclear Material ◽  
Nuclear Materials ◽  
Material Control ◽  
Nuclear Disaster ◽  
Muon Tomography ◽  
Debris Removal ◽  
Fukushima Daiichi ◽  
Near Future

A method to measure an amount of nuclear materials in fuel debris by using muon tomography has being developed for proceeding with decommissioning of Fukushima Daiichi nuclear power plant. As a result of the Fukushima Daiichi nuclear disaster, the molten fuels were mixed with reactor structures and accumulated as fuel debris in the reactor buildings. There is still a large amount of fuel debris remained in each reactor. Fuel debris removal is planned in the near future and the debris will be taken out in this process. The debris need to be inspected from a viewpoint of nuclear material control. Since the debris is a mixture of fuel and other structures, it is hard to quantitate nuclear materials in debris by existing measurement method. Muons are cosmic-ray particles which have high energies, therefore, they are highly penetrative. This feature makes muon tomography sensitive to find heavy materials such as uranium or plutonium. We conducted a simulation study of applying muon tomography to measure fuel debris by using a Monte-Carlo method. A simulation model which includes muon detectors, shielding container and fuel debris was constructed to reproduce a measurement situation at the site. In conclusion, muon tomography quantitate the nuclear materials, therefore, this method should be useful for the fuel debris removal of Fukushima Daiichi reactors.

scholarly journals GEANT4 Simulation of a Cosmic Ray Muon Tomography System With Micro-Pattern Gas Detectors for the Detection of High-${\rm Z}$ Materials

2009 ◽  
Vol 56 (3) ◽  
pp. 1356-1363 ◽  
Author(s):  
Marcus Hohlmann ◽  
Patrick Ford ◽  
Kondo Gnanvo ◽  
Jennifer Helsby ◽  
David Pena ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Geant4 Simulation ◽  
Gas Detectors ◽  
Tomography System ◽  
Muon Tomography ◽  
Micro Pattern

scholarly journals Joint inversion of gravity with cosmic ray muon data at a well-characterized site for shallow subsurface density prediction

2019 ◽  
Vol 217 (3) ◽  
pp. 1988-2002 ◽  
Author(s):  
Katherine Cosburn ◽  
Mousumi Roy ◽  
Elena Guardincerri ◽  
Charlotte Rowe
Keyword(s):  
Joint Inversion ◽  
Spatial Scales ◽  
Cosmic Ray ◽  
Target Volume ◽  
Density Structure ◽  
Shallow Subsurface ◽  
Density Prediction ◽  
Muon Tomography ◽  
Gravity Measurements ◽  
Set Up

SUMMARYEstimating subsurface density is important for imaging various geologic structures such as volcanic edifices, reservoirs and aquifers. Muon tomography has recently been used to complement traditional gravity measurements as a powerful method for probing shallow subsurface density structure beneath volcanoes. Gravity and muon data have markedly different spatial sensitivities and, as a result, the combination is useful for imaging structures on spatial scales that are larger than the area encompassed by crossing muon trajectories. Here we explore and test a joint inversion of gravity and muon data in a study area where there is an independently characterized target anomaly: a regionally extensive, high-density layer beneath Los Alamos, New Mexico, USA. We resolve the nearly flat-lying structure using a unique experimental set-up wherein surface and subsurface gravity and muon measurements are obtained above and below the target volume. Our results show that with minimal geologic (prior) constraints, the joint inversion correctly recovers salient features of the expected density structure. The results of our study illustrate the potential of combining surface and subsurface (e.g. borehole) gravity and muon measurements to invert for shallow geologic structures.

The Measurement of Calcium Absorption and Absorption Rate with an External Arm Radioactivity Counter

1978 ◽  
Vol 54 (1) ◽  
pp. 93-97
Author(s):  
R. C. Smart ◽  
C. D. Holdsworth
Keyword(s):  
Absorption Rate ◽  
Calcium Absorption ◽  
Scintillation Counter ◽  
Total Calcium ◽  
Ratio Determination ◽  
Lead Shielding ◽  
Deconvolution Techniques ◽  
Serial Measurements ◽  
Radioactivity Measurements

1. A large-volume scintillation counter was used to measure calcium absorption from the ratio of forearm uptake of 47Ca after oral 47CaCl2 (administered with milk) to forearm uptake after intravenously administered 47CaCl2. 2. In some subjects serial measurements of both forearm uptake of 47Ca and blood 47Ca radioactivity were also recorded, and by using deconvolution both total calcium absorption and calcium absorption rate were determined. 3. The forearm ratio determination of 47Ca absorption correlated well with that obtained by deconvolution of either serial blood 47Ca or forearm 47Ca measurements provided that the forearm radioactivity measurements were made at least 8 h after the administrations of 47CaCl2. 4. Although the two deconvolution techniques gave similar estimates of total calcium absorption there were discrepancies between their measurements of calcium absorption rate. These discrepancies were reduced but not eliminated by the use of additional lead shielding around the Armac counter.

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