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ASTM C 1455 Document Information:
Title
Standard Test Method for Nondestructive Assay of Special Nuclear Material Holdup Using Gamma-Ray Spectroscopic Methods
ASTM International
Publication Date:
Jun 1, 2007
Scope:
This test method describes gamma-ray methods used to
nondestructively measure the quantity of 235U, or
239Pu remaining as holdup in nuclear facilities. Holdup
occurs in all facilities where nuclear material is processed, in
process equipment, in exhaust ventilation systems and in building
walls and floors.
This test method includes information useful for management,
planning, selection of equipment, consideration of interferences,
measurement program definition, and the utilization of resources
(1, 2, 3, 4).2
The measurement of nuclear material hold up in process equipment
requires a scientific knowledge of radiation sources and detectors,
transmission of radiation, calibration, facility operations and
error analysis. It is subject to the constraints of the facility,
management, budget, and schedule; plus health and safety
requirements; as well as the laws of physics. The measurement
process includes defining measurement uncertainties and is
sensitive to the form and distribution of the material, various
backgrounds, and interferences. The work includes investigation of
material distributions within a facility, which could include
potentially large holdup surface areas. Nuclear material held up in
pipes, ductwork, gloveboxes, and heavy equipment, is usually
distributed in a diffuse and irregular manner. It is difficult to
define the measurement geometry, to identify the form of the
material, and to measure it without interference from adjacent
sources of radiation.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
2 The boldface numbers in parentheses refer to the
list of references at the end of this standard.
Keywords:
- holdup
- holdup measurements
- in-process inventory
- material holdup
- nuclear material holdup
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