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Title: Benchmark test of neutron transport calculations: Indium, nickel, gold, europium, and cobalt activation with and without energy moderated fission neutrons by iron simulating the Hiroshima atomic bomb casing

Abstract

A benchmark test of the Monte Carlo neutron and photon transport code system (MCNP) was performed using a bare- and energy-moderated {sup 252}Cf fission neutron source which was obtained by transmission through 10-cm-thick iron. An iron plate was used to simulate the effect of the Hiroshima atomic bomb casing. This test includes the activation of indium and nickel for fast neutrons and gold, europium, and cobalt for thermal and epithermal neutrons, which were inserted in the moderators. The latter two activations are also to validate {sup 152}Eu and {sup 60}Co activity data obtained from the atomic bomb-exposed specimens collected at Hiroshima and Nagasaki, Japan. The neutron moderators used were Lucite and Nylon 6 and the total thickness of each moderator was 60 cm or 65 cm. Measured activity data (reaction yield) of the neutron-irradiated detectors in these moderators decreased to about 1/1,000th or 1/10,000th, which corresponds to about 1,500 m ground distance from the hypocenter in Hiroshima. For all of the indium, nickel, and gold activity data, the measured and calculated values agreed within 25%, and the corresponding values for europium and cobalt were within 40%. From this study, the MCNP code was found to be accurate enough for themore » bare- and energy-moderated {sup 252}Cf neutron activation calculations of these elements using moderators containing hydrogen, carbon, nitrogen, and oxygen. 18 refs., 10 figs., 4 tabs.« less

Authors:
; ; ; ; ;  [1];  [2]
  1. Hiroshima Univ., Higashi-Hiroshima (Japan)
  2. Kure Women`s College, Hiroshima-ken (Japan)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
54456
Resource Type:
Journal Article
Resource Relation:
Journal Name: Health Physics; Journal Volume: 67; Journal Issue: 4; Other Information: PBD: Oct 1994
Country of Publication:
United States
Language:
English
Subject:
56 BIOLOGY AND MEDICINE, APPLIED STUDIES; PHOTON TRANSPORT; MEASURING METHODS; NEUTRON TRANSPORT; MONTE CARLO METHOD; VALIDATION; NUCLEAR WEAPONS; SIMULATION; EUROPIUM 152; CALIFORNIUM 252; NEUTRON SOURCES; COBALT 60; MODERATING DETECTORS; FISSION SPECTRA

Citation Formats

Iwatani, Kazuo, Shizuma, Kiyoshi, Hasai, Hiromi, Hoshi, Masaharu, Hiraoka, Masayuki, Hayakawa, Norihiko, and Oka, Takamitsu. Benchmark test of neutron transport calculations: Indium, nickel, gold, europium, and cobalt activation with and without energy moderated fission neutrons by iron simulating the Hiroshima atomic bomb casing. United States: N. p., 1994. Web. doi:10.1097/00004032-199410000-00006.
Iwatani, Kazuo, Shizuma, Kiyoshi, Hasai, Hiromi, Hoshi, Masaharu, Hiraoka, Masayuki, Hayakawa, Norihiko, & Oka, Takamitsu. Benchmark test of neutron transport calculations: Indium, nickel, gold, europium, and cobalt activation with and without energy moderated fission neutrons by iron simulating the Hiroshima atomic bomb casing. United States. doi:10.1097/00004032-199410000-00006.
Iwatani, Kazuo, Shizuma, Kiyoshi, Hasai, Hiromi, Hoshi, Masaharu, Hiraoka, Masayuki, Hayakawa, Norihiko, and Oka, Takamitsu. Sat . "Benchmark test of neutron transport calculations: Indium, nickel, gold, europium, and cobalt activation with and without energy moderated fission neutrons by iron simulating the Hiroshima atomic bomb casing". United States. doi:10.1097/00004032-199410000-00006.
@article{osti_54456,
title = {Benchmark test of neutron transport calculations: Indium, nickel, gold, europium, and cobalt activation with and without energy moderated fission neutrons by iron simulating the Hiroshima atomic bomb casing},
author = {Iwatani, Kazuo and Shizuma, Kiyoshi and Hasai, Hiromi and Hoshi, Masaharu and Hiraoka, Masayuki and Hayakawa, Norihiko and Oka, Takamitsu},
abstractNote = {A benchmark test of the Monte Carlo neutron and photon transport code system (MCNP) was performed using a bare- and energy-moderated {sup 252}Cf fission neutron source which was obtained by transmission through 10-cm-thick iron. An iron plate was used to simulate the effect of the Hiroshima atomic bomb casing. This test includes the activation of indium and nickel for fast neutrons and gold, europium, and cobalt for thermal and epithermal neutrons, which were inserted in the moderators. The latter two activations are also to validate {sup 152}Eu and {sup 60}Co activity data obtained from the atomic bomb-exposed specimens collected at Hiroshima and Nagasaki, Japan. The neutron moderators used were Lucite and Nylon 6 and the total thickness of each moderator was 60 cm or 65 cm. Measured activity data (reaction yield) of the neutron-irradiated detectors in these moderators decreased to about 1/1,000th or 1/10,000th, which corresponds to about 1,500 m ground distance from the hypocenter in Hiroshima. For all of the indium, nickel, and gold activity data, the measured and calculated values agreed within 25%, and the corresponding values for europium and cobalt were within 40%. From this study, the MCNP code was found to be accurate enough for the bare- and energy-moderated {sup 252}Cf neutron activation calculations of these elements using moderators containing hydrogen, carbon, nitrogen, and oxygen. 18 refs., 10 figs., 4 tabs.},
doi = {10.1097/00004032-199410000-00006},
journal = {Health Physics},
number = 4,
volume = 67,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 1994},
month = {Sat Oct 01 00:00:00 EDT 1994}
}