Quasi-monoenergetic neutron beams with energies from 25 to 70MeV

Schuhmacher, H.; Brede, H.J.; Dangendorf, V.; Kuhfuss, M; Meulders, Jean‐Pierre; Newhauser, W; Nolte, R.

doi:10.1016/s0168-9002(98)01267-4

Cited by 48 publications

(34 citation statements)

References 10 publications

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“…For peak energies below 45 MeV, interpolated and smoothed experimental data of Byrd and Sailor [40], Baba et al [43], and Schuhmacher et al [44] were used. In cases when the measured spectra do not cover a sufficiently wide range of secondary neutron energies, we used a constant extrapolation to lower energies, which was found to be a reasonable approximation, according to Nolte et al [45].…”

Section: B Neutron Spectrummentioning

confidence: 99%

Measurements of neutron-induced fission cross sections forBi209,Pbnat,Pb
Smirnov¹,
Eismont
²
,
Filatov
³

et al. 2004
Phys. Rev. C
21
1
8
0
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U have been measured in the 30-180 MeV energy range using the neutron beam facility at The Svedberg Laboratory in Uppsala. The 7 Li͑p , n͒ reaction was employed as a neutron source. The fission fragments were detected by thin-film breakdown counters. Cross sections at specific energies were determined using unfolding techniques with respect to the excitation function and the neutron spectra, the latter obtained from recent measurements and an evaluation. The absolute fission cross sections were obtained using the standard 238 U͑n , f͒ cross section. The nat W͑n , f͒ and 181 Ta͑n , f͒ cross sections have been measured for the first time. The results for 209 Bi͑n , f͒ , nat Pb͑n , f͒ , 208 Pb͑n , f͒, and 197 Au͑n , f͒ cross sections have been compared with available literature data. A universal easy-to-use parametrization has been suggested for all measured cross sections. The common features of subactinide neutron-induced fission cross sections are found to be similar to those of the proton-induced fission data.

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Section: B Neutron Spectrummentioning

confidence: 99%

Measurements of neutron-induced fission cross sections forBi209,Pbnat,Pb
Smirnov¹,
Eismont
²
,
Filatov
³

et al. 2004
Phys. Rev. C
21
1
8
0
View full text Add to dashboard Cite

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“…However, there are a number of other facilities that might equally well be used for these tests. For example there are facilities producing mono-energetic or quasimono-energetic neutrons, e.g., UC Davis [8], IUCF [9], TRIUMF [10], NAC [11], TIARA [12], UCL [13], RIKEN [14], and TSL [15].…”

Section: Introductionmentioning

confidence: 99%

A comparative study between two neutron facilities regarding SEU

Granlund¹,

Granbom²,

Olsson

2004

IEEE Trans. Nucl. Sci.

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We report on a comparative study between two neutron facilities used for SEU studies, namely the Weapons Neutron Research facility at Los Alamos National Laboratory (a white neutron source), and the The Svedberg Laboratory in Sweden (a quasimono-energetic neutron source). The soft error rates generated from TSL are in excellent agreement with those from WNR. Moreover, an increase of the SER for small process technologies was observed.

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“…These were a broad, partly thermalised neutron spectrum,`Canel' (3) , and a highly thermalised neutron spectrum,`Sigma' (4) . Measurements were also performed in a high neutron energy ®eld at the CERN reference radiation facility (CERF) (5,6) . The neutron responses to the intermediate neutron energy region (Figure 3) have not yet been determined, and therefore the dashed lines between 2.5 Â 10 À8 and 0.07 MeV are only a guideline.…”

Section: Energy Dependence Of Neutron Responsementioning

confidence: 99%

Present status of the personal neutron dosemeter based on direct ion storage

Fiechtner

Boschung

Wernli

2004

Radiation Protection Dosimetry

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In this paper the present status of the Direct Ion Storage Neutron (DIS-N) prototype dosemeter (RADOS) is described. The separation of neutron from photon dose equivalent has been improved by adding tin shieldings. The neutron energy response has been changed by additional plastic covers containing 40% B 4 C in order to reduce the over-response to thermal neutrons. The responses of the dosemeters were determined for standard photon and neutron ®elds (monoenergetic neutrons, neutron sources and simulated workplace ®elds). Irradiations in real workplaces were also performed. The dependence of the neutron response on the angle of incidence was measured for different neutron sources. DESIGN OF IMPROVED DIS-N DOSEMETERThe personal neutron dosemeter DIS-N (Figure 1), produced by RADOS Technology Oy, is based on ionisation chambers with direct ion storage and a double-chamber system that allows differential readings to separate the neutron from the photon dose equivalent (1) . The photon energy response of the two chambers of former DIS-N prototypes was signi®cantly different in the photon energy region below 100 keV, which could have led to a false determination of the personal neutron dose equivalent. The situation has been improved by adding in all dosemeter types a 1-mm-thick tin shielding around the chambers to cut off photon energies below 100 keV.Furthermore, former designs tended to an overresponse to thermal neutrons, which can be reduced by surrounding the dosemeter with plastic`boroncovers' containing 40% B 4 C. Four types of dosemeter (Table 1) were built and tested under different circumstances. The wall materials of the neutron/ photon sensitive chambers are made of A-150 containing 1.25% boron nitride (BN) or polyethylene (PE) containing 4% LiNO 3 . The photon-sensitive chambers were in all cases made of Te¯on (polytetra¯ouroethylene) containing 60% graphite. The size of a dosemeter is 45 Â 45 Â 15 mm 3 , and the weight is about 56 g. The readout of the dosemeter is performed with a table-top unit (DBR-1). IRRADIATION CONDITIONSThe dosemeters were mounted for all irradiations on the ISO water-slab-phantom of size 30 Â 30 Â 15 cm 3 . The distance to the radiation source was measured from the front plane of the phantom and varied between 0.5 and 1 m. ENERGY DEPENDENCE OF PHOTON RESPONSEThe energy dependence of the photon response was determined at the calibration laboratory of the Paul Scherrer Institut between 24 and 660 keV at normal incidence. Typical results for the neutron/photonsensitive chamber and the photon-sensitive chamber of the PE (4% LiNO 3 ) dosemeter are shown in Figure 2. Due to the tin shielding, photon energies lower than 100 keV may be neglected. Thus the energy dependences of the photon response are very similar, and the separation of neutron from photon dose equivalent is improved in mixed neutron/ photon ®elds. ENERGY DEPENDENCE OF NEUTRON RESPONSEThe energy dependence of the personal neutron dose equivalent response, shown in Table 2 and Figure 3,

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Quasi-monoenergetic neutron beams with energies from 25 to 70MeV

Cited by 48 publications

References 10 publications

Measurements of neutron-induced fission cross sections forBi209,Pbnat,Pb
Smirnov¹,
Eismont
²
,
Filatov
³

et al. 2004
Phys. Rev. C
21
1
8
0
View full text Add to dashboard Cite

Measurements of neutron-induced fission cross sections forBi209,Pbnat,Pb
Smirnov¹,
Eismont
²
,
Filatov
³

et al. 2004
Phys. Rev. C
21
1
8
0
View full text Add to dashboard Cite

A comparative study between two neutron facilities regarding SEU

Present status of the personal neutron dosemeter based on direct ion storage

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Quasi-monoenergetic neutron beams with energies from 25 to 70MeV

Cited by 48 publications

References 10 publications

Measurements of neutron-induced fission cross sections forBi209,Pbnat,PbSmirnov1, Eismont2, Filatov3 et al. 2004Phys. Rev. C21180View full textAdd to dashboardCite

Measurements of neutron-induced fission cross sections forBi209,Pbnat,PbSmirnov1, Eismont2, Filatov3 et al. 2004Phys. Rev. C21180View full textAdd to dashboardCite

A comparative study between two neutron facilities regarding SEU

Present status of the personal neutron dosemeter based on direct ion storage

Contact Info

Product

Resources

About

Measurements of neutron-induced fission cross sections forBi209,Pbnat,Pb
Smirnov¹,
Eismont
²
,
Filatov
³

et al. 2004
Phys. Rev. C
21
1
8
0
View full text Add to dashboard Cite

Measurements of neutron-induced fission cross sections forBi209,Pbnat,Pb
Smirnov¹,
Eismont
²
,
Filatov
³

et al. 2004
Phys. Rev. C
21
1
8
0
View full text Add to dashboard Cite