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A new approach for establishing a primary standard of Kerma in air, in a {sup 60}Co gamma ray beam

Conference:

Abstract

The determination of a primary standard of kerma in air is generally based on the use of an absolute cavity ionization chamber, with graphite wall and filled with air. For laboratories in possession of primary standard graphite calorimeters, it appears possible to derive by a transfer method air kerma from absorbed dose in graphite. This derivation can be achieved using a transfer instrument, e.g. a small air-filled cavity chamber, successively irradiated in the graphite phantom at the reference depth and in free air. The advantages of this method are the replacement on an absolute current measurement by a relative one, the replacement of the graphite-to-air stopping power ratio by the quotient of that stopping power ratio in free air by that in graphite, the elimination of the effective volume of the chamber and of W, the mean energy expended per ion pair formed in air. In return, a correction factor for the perturbation of the particle fluence, due to the air cavity irradiated in the graphite phantom must be applied. A critical analysis of accuracies proper to both methods is made, the expected gains in metrological safety with the new method pointed out, and preliminary results are presented. (author).
Publication Date:
Dec 01, 1993
Product Type:
Conference
Report Number:
CEA-CONF-11410; CONF-930545-
Reference Number:
SCA: 560101; PA: AIX-25:002772; EDB-94:015337; ERA-19:005370; NTS-94:014141; SN: 93001120306
Resource Relation:
Conference: International symposium on the measurement assurance in dosimetry,Vienna (Austria),24-27 May 1993; Other Information: PBD: 1993
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; KERMA; AIR; GAMMA DOSIMETRY; ACCURACY; CALIBRATION STANDARDS; COBALT 60; GAMMA RADIATION; 560101; DOSIMETRY AND MONITORING
OSTI ID:
10111291
Research Organizations:
CEA Centre d`Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Applications et de la Metrologie des Rayonnements Ionisants
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: DE94609001; TRN: FR9302957002772
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
FRN
Size:
11 p.
Announcement Date:
Jun 30, 2005

Conference:

Citation Formats

Chauvenet, B, Delaunay, F, and Simoen, J P. A new approach for establishing a primary standard of Kerma in air, in a {sup 60}Co gamma ray beam. France: N. p., 1993. Web.
Chauvenet, B, Delaunay, F, & Simoen, J P. A new approach for establishing a primary standard of Kerma in air, in a {sup 60}Co gamma ray beam. France.
Chauvenet, B, Delaunay, F, and Simoen, J P. 1993. "A new approach for establishing a primary standard of Kerma in air, in a {sup 60}Co gamma ray beam." France.
@misc{etde_10111291,
title = {A new approach for establishing a primary standard of Kerma in air, in a {sup 60}Co gamma ray beam}
author = {Chauvenet, B, Delaunay, F, and Simoen, J P}
abstractNote = {The determination of a primary standard of kerma in air is generally based on the use of an absolute cavity ionization chamber, with graphite wall and filled with air. For laboratories in possession of primary standard graphite calorimeters, it appears possible to derive by a transfer method air kerma from absorbed dose in graphite. This derivation can be achieved using a transfer instrument, e.g. a small air-filled cavity chamber, successively irradiated in the graphite phantom at the reference depth and in free air. The advantages of this method are the replacement on an absolute current measurement by a relative one, the replacement of the graphite-to-air stopping power ratio by the quotient of that stopping power ratio in free air by that in graphite, the elimination of the effective volume of the chamber and of W, the mean energy expended per ion pair formed in air. In return, a correction factor for the perturbation of the particle fluence, due to the air cavity irradiated in the graphite phantom must be applied. A critical analysis of accuracies proper to both methods is made, the expected gains in metrological safety with the new method pointed out, and preliminary results are presented. (author).}
place = {France}
year = {1993}
month = {Dec}
}