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Study for optimization of a {sup 60} Co industrial irradiator of 250 k Ci.; Estudio para la optimizacion de un irradiador industrial de {sup 60} Co de 250 kCi.

Abstract

This work presents results of a benchmark between calculated and experimental absorbed dose values for a typical product, in a {sup 60} Co industrial irradiator, located at ININ, Mexico. The goal of this work is to reach a {+-} 10 % approximation between both values. ININ {sup 60} Co industrial irradiator is a two level, two layer system with overlapping product configuration, 56 irradiation positions with an activity of around 250 k Ci. Calculated values were obtained by QAD-CGGP code. This code uses a point kernel technique, build-up factors fitting was done by geometrical progression and combinatorial geometry was used for 3 D system description. Main code modifications were related with source simulation by punctual sources and energy spectrum (16 energy groups) and anisotropic emission were also considered. Experimental data were obtained from routine dosimetry which was done with red acrylic pellets; they were irradiated together the product in predetermined positions, for 36 maximum and minimum absorbed dose values. Typical product was polypropylene Petri dish packages, apparent density 0.13 g/cm{sup 3}. It was chosen because regular geometry (2 packages per full irradiator container) and enough amount for considering homogeneous loading inside irradiation chamber. Required minimum dose was 15 kGy. Results  More>>
Authors:
Publication Date:
Dec 31, 1995
Product Type:
Thesis/Dissertation
Report Number:
INIS-mf-14656
Reference Number:
SCA: 070201; 990200; PA: AIX-27:005552; EDB-96:025584; NTS-96:009541; SN: 96001531139
Resource Relation:
Other Information: TH: Thesis (M. in Sc.).; PBD: 1995
Subject:
07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; IRRADIATION PLANTS; COMPUTERIZED SIMULATION; MATHEMATICAL MODELS; ACRYLATES; COBALT 60; CONTAINERS; GAMMA DOSIMETRY; GAMMA RADIATION; LINEAR PROGRAMMING; OPTIMIZATION; Q CODES; RADIATION DOSES; SHIELDING
OSTI ID:
172719
Research Organizations:
Universidad Nacional Autonoma de Mexico, Mexico City (Mexico). Facultad de Quimica
Country of Origin:
Mexico
Language:
Spanish
Other Identifying Numbers:
Other: ON: DE96609705; TRN: MX9500033005552
Availability:
INIS; OSTI as DE96609705
Submitting Site:
INIS
Size:
59 p.
Announcement Date:

Citation Formats

Pina V, G. Study for optimization of a {sup 60} Co industrial irradiator of 250 k Ci.; Estudio para la optimizacion de un irradiador industrial de {sup 60} Co de 250 kCi.. Mexico: N. p., 1995. Web.
Pina V, G. Study for optimization of a {sup 60} Co industrial irradiator of 250 k Ci.; Estudio para la optimizacion de un irradiador industrial de {sup 60} Co de 250 kCi.. Mexico.
Pina V, G. 1995. "Study for optimization of a {sup 60} Co industrial irradiator of 250 k Ci.; Estudio para la optimizacion de un irradiador industrial de {sup 60} Co de 250 kCi." Mexico.
@misc{etde_172719,
title = {Study for optimization of a {sup 60} Co industrial irradiator of 250 k Ci.; Estudio para la optimizacion de un irradiador industrial de {sup 60} Co de 250 kCi.}
author = {Pina V, G}
abstractNote = {This work presents results of a benchmark between calculated and experimental absorbed dose values for a typical product, in a {sup 60} Co industrial irradiator, located at ININ, Mexico. The goal of this work is to reach a {+-} 10 % approximation between both values. ININ {sup 60} Co industrial irradiator is a two level, two layer system with overlapping product configuration, 56 irradiation positions with an activity of around 250 k Ci. Calculated values were obtained by QAD-CGGP code. This code uses a point kernel technique, build-up factors fitting was done by geometrical progression and combinatorial geometry was used for 3 D system description. Main code modifications were related with source simulation by punctual sources and energy spectrum (16 energy groups) and anisotropic emission were also considered. Experimental data were obtained from routine dosimetry which was done with red acrylic pellets; they were irradiated together the product in predetermined positions, for 36 maximum and minimum absorbed dose values. Typical product was polypropylene Petri dish packages, apparent density 0.13 g/cm{sup 3}. It was chosen because regular geometry (2 packages per full irradiator container) and enough amount for considering homogeneous loading inside irradiation chamber. Required minimum dose was 15 kGy. Results showed a 8% variation between calculated and experimental values for maximum absorbed dose (18.2 kGy vs 16.8 kGy) and 3 % variation for minimum absorbed dose (13.8 kGy vs 14.3 kGy); these results fixed with the original proposal. (Author).}
place = {Mexico}
year = {1995}
month = {Dec}
}