Angular Dependence of a Simple Accident Dosimeter

Conference · Sun Sep 12 00:00:00 EDT 2004

OSTI ID:977674

Devine, Robert T. ^[1]; Romero, Leonard L. ^[1]; Olsher, Richard H. ^[1]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

A simple dosimeter made of a sulfur tablet, bare and cadmium covered indium foils and a cadmium covered copper foil has been modeled using MCNP5. Studies of the model without phantom or other confounding factors have shown that the cross sections and fluence-to-dose factors generated by the Monte Carlo method agree with those generated by analytic expressions for the high energy component. The threshold cross sections for the detectors on a phantom were calculated. The resulting doses assigned agree well with exposures made to three critical assemblies. In this study the angular dependence on a phantom is studied and compared with measurements taken on the GODIVA reactor. The dosimeter positions on the phantom are facing the source, on the back and the side. In previous papers the modeling of a simple dosimeter made of a sulfur tablet, bare and cadmium covered indium foils and a cadmium covered copper foil has been modeled using MCNP5. The conclusion made was that most of the neutron dose from criticality assemblies results from the high energy neutron fluences determined by the sulfur and indium detectors. The results using doses measured from the GODIVA, SHEBA, and bare and lead shielded SILENE reactors confirmed this. The angular dependence of an accident dosemeter is of interest in evaluating the exposure of personnel. To investigate this effect accident dosemeters were placed on a phantom and exposed to the GODIVA reactor at phantom orientations of 0^o, 45^o, 90^o, 135^o, and 180^o to the assembly center line.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• OSTI ID: 977674
• Report Number(s): LA-UR--04-3892
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
97 MATHEMATICS AND COMPUTING
ACCIDENTS
CADMIUM
COPPER
CRITICALITY
CROSS SECTIONS
DOSEMETERS
GODIVA REACTOR
GODIVA
SHEBA
INDIUM
MCNP5
MONTE CARLO METHOD
NEUTRON FLUENCE
NEUTRONS
Nuclear Criticality Safety Program (NCSP)
PERSONNEL
PHANTOMS
SILENE
SILENE REACTOR
SIMULATION
SULFUR
ZERO POWER REACTORS