Delayed gamma determination at the JSI TRIGA reactor by synchronous measurements with fission and ionization chambers

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2018.09.103 ◽

2018 ◽

Vol 911 ◽

pp. 94-103 ◽

Cited By ~ 8

Author(s):

K. Ambrožič ◽

A. Gruel ◽

V. Radulović ◽

M. Le Guillou ◽

P. Blaise ◽

...

Keyword(s):

Ionization Chambers ◽

Triga Reactor

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Validation of the neutron and gamma fields in the JSI TRIGA reactor using in-core fission and ionization chambers

Applied Radiation and Isotopes ◽

10.1016/j.apradiso.2014.10.026 ◽

2015 ◽

Vol 96 ◽

pp. 27-35 ◽

Cited By ~ 36

Author(s):

Gašper Žerovnik ◽

Tanja Kaiba ◽

Vladimir Radulović ◽

Anže Jazbec ◽

Sebastjan Rupnik ◽

...

Keyword(s):

Ionization Chambers ◽

Triga Reactor

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Usage of multiple fission cells for neutron flux measurements during rod-insertion method

EPJ Web of Conferences ◽

10.1051/epjconf/202022504024 ◽

2020 ◽

Vol 225 ◽

pp. 04024

Author(s):

Igor Lengar ◽

Sebastjan Rupnik ◽

Andrej Žohar ◽

Vid Merljak ◽

Marjan Kromar ◽

...

Keyword(s):

Neutron Flux ◽

Nuclear Power ◽

Physical Parameters ◽

Ionization Chambers ◽

Triga Reactor ◽

Control Rod ◽

Multiple Fission ◽

Insertion Method ◽

Flux Measurements ◽

Control Rods

The measurements of physical parameters of the TRIGA reactor and Nuclear power plant Krško (NEK) reactor cores have been in the past performed on hand of the neutron flux signal obtained from uncompensated ionization cells and by employment of the a digital meter of reactivity (DMR). At the TRIGA reactor only one ionization cell is currently used for flux measurements. During the insertion of one control rod the neutron flux distribution is significantly altered affecting the flux measurements of inserting different control rods. The problem is presently solved by assigning a correction factor to each control rod what introduces an additional uncertainty. In the present paper the implementation of four fission cells for reactivity measurements is presented. In this way determining the correct gamma background and its subtraction, performed by DMR algorithms, becomes less important as previously by using ionization chambers. The larger number of detectors also reduces the flux redistribution effects on the signal during individual control rod movements.

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National primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2019

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-8-8-12 ◽

2020 ◽

pp. 8-12

Author(s):

Alexandr V. Oborin ◽

Anna Y. Villevalde ◽

Sergey G. Trofimchuk

Keyword(s):

Gamma Radiation ◽

Energy Flux ◽

Primary Standard ◽

Average Energy ◽

Ion Pair ◽

X Rays ◽

Exposure Rate ◽

Ionization Chambers ◽

Air Kerma ◽

Air Kerma Rate

The results of development of the national primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2011 in 2019 are presented according to the recommendations of the ICRU Report No. 90 “Key Data for Ionizing-Radiation Dosimetry: Measurement Standards and Applications”. The following changes are made to the equations for the units determination with the standard: in the field of X-rays, new correction coefficients of the free-air ionization chambers are introduced and the relative standard uncertainty of the average energy to create an ion pair in air is changed; in the field of gamma radiation, the product of the average energy to create an ion pair in air and the electron stopping-power graphite to air ratio for the cavity ionization chambers is changed. More accurate values of the units reproduced by GET 8-2019 are obtained and new metrological characteristics of the standard are stated.

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