V�D-2 secondary emission detectors for measuring?-radiation dose rates

Chuklyaev, S. V.; Odintsov, Yu. M.; Pepelyshev, Yu. N.; Koshelev, A. S.

doi:10.1007/bf00739364

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…It is evident that inside the core of the BR-1 reactor the time dependence of photon dose rate differs substantially from that outside the core. As the distance from the core increases, the relative contribution of the photon radiation emitted from the radiation protection of the reactor box increases [15].…”

Section: Results Of Photon Radiation Measurementsmentioning

confidence: 99%

“…Vacuum Fission Chamber. The KNVK chamber, compensated with respect to the current from the external γ-radiation, contains a system of three electrodes placed in a hermetic case [2][3][4] (Fig. 1).…”

mentioning

confidence: 99%

“…The electric current of VED-2 is proportional to the dose rate absorbed in the electrode system [4,9]. The contribution of the fast neutrons to the sensitivity of VED-2 was evaluated by irradiation in fields with different ratio of γ-ray and neutron components by comparing with the indications of γ-ray dosimeters [10][11][12].…”

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confidence: 99%

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Fission vacuum chambers and secondary-emission detectors as effective tools for measuring the characteristics of γ and neutron radiation from intense sources

Chuklyaev¹,

Dovbysh

Koshelev

2010

At Energy

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The results of measurements of the flux of fast neutrons in the density range 2·10 8 -2·10 19 sec -1 ·cm -2 and γ-ray dose rate in the range 2·10 -3 -1·10 9 Gy/sec in different operating regimes of pulsed nuclear reactors and accelerators are presented. The parameters of the delayed photon radiation are presented.Intense sources of neutrons are used for scientific research and testing materials and articles [1]. Efficient and informative checking of the characteristics of the radiation is accomplished in neutrons sources equipped with vacuum chambers and electronic apparatus.The present article gives the results of measurements of the fast-neutron flux density in the range 2·10 8 -2·10 19 sec -1 ·cm -2 and γ-ray dose rate in the range 2·10 -3 -1·10 9 Gy/sec in different operating regimes of nuclear reactors and a linear accelerator. The parameters of the delayed photon radiation are determined.Formation of the Radiation Field in a Reactor Pulse. The power of a reactor is determined by fission rate of nuclei in the core -dN f /dt. The fast-neutron flux arising in the process ϕ n is proportional to dN f /dt and the power of the reactor.The time dependence of the absorbed dose rate of photon radiation P γ can be represented in the form P γ (t) = P pr (t) + P del (t) + P nγ (t) + P ph ,where P pr and P del are the dose rates due to prompt and delayed photons, respectively; P nγ is the dose rate due to photon radiation emitted in the process of neutron moderation; P ph is the dose rate due to photon radiation in the stopped reactor. In an operating reactor, the total absorbed dose rate from prompt and delayed photons, arising in the process of moderation of the fast neutrons, is substantially higher that the photon dose rate in a stopped reactor. For this reason, we shall write relation (1) in the form P γ (t) = P pr (t) + P del (t) + P nγ (t).Since the dose rate of the photon radiation is due to a fission reaction coefficient, the relation assumes the form P γ (t) = K γ1 ϕ n + K γ2 ϕ n* g + B(r)ϕ n* ζ,

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Section: Results Of Photon Radiation Measurementsmentioning

confidence: 99%

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confidence: 99%

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Fission vacuum chambers and secondary-emission detectors as effective tools for measuring the characteristics of γ and neutron radiation from intense sources

Chuklyaev¹,

Dovbysh

Koshelev

2010

At Energy

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Gas-Filled Ionization Chamber and Secondary-Emission Detector for Measuring γ-Ray Dose Rate

Chuklyaev¹,

Koshelev

2020

At Energy

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A secondary electron emission detector for measuring the intensity of synchrotron radiation

Nariyama

Taniguchi

2005

Review of Scientific Instruments

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A secondary electron emission detector can be used as a high-intensity radiation beam monitor because the absence of ion recombination extends the upper dose range of the monitor. The characteristics of saturation, linearity, sensitivity, reproducibility, and current stability of the monitor were measured with respect to synchrotron radiation from undulators at SPring-8. Thin aluminum-evaporated electrodes were used in a vacuum chamber. Linearity was observed at 1011–1013photons∕s between 10 and 30keV. Even at the highest intensity of 1015photons∕s, current linearity was achieved to some extent. Sensitivity ranged from 27to55pC∕Gy∕cm2, and increased with decreasing energy. During long irradiation, the current decreased gradually with time; the degree became larger with the dose. When irradiation was interrupted, however, the current recovered to its initial value at the next irradiation.

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V�D-2 secondary emission detectors for measuring?-radiation dose rates

Cited by 3 publications

References 5 publications

Fission vacuum chambers and secondary-emission detectors as effective tools for measuring the characteristics of γ and neutron radiation from intense sources

Fission vacuum chambers and secondary-emission detectors as effective tools for measuring the characteristics of γ and neutron radiation from intense sources

Gas-Filled Ionization Chamber and Secondary-Emission Detector for Measuring γ-Ray Dose Rate

A secondary electron emission detector for measuring the intensity of synchrotron radiation

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