Nuclear heating measurements by gamma and neutron thermometers

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Abstract

A gamma thermometer suitable for very high gamma heating levels (up to 20 W/g) has been designed and modelled by means of detailed finite element calculations. Based on a sensitivity analysis, the predicted accuracy of this gamma thermometer is better than 5 %. A novel miniaturized gamma thermometer is proposed in which a single thermocouple is used as the gamma absorption element, allowing a reduction of the sensor diameter down to 3 mm. Monte Carlo calculations (by MCNP) have been performed to assess the relative contribution of neutrons to the nuclear heating in a gamma thermometer. Calculations have been performed for gamma thermometers with an inner body made of various materials, such as stainless steel, tungsten, molybdenum and rhodium. By using gamma thermometers made of different materials, it will be possible to deduce the nuclear heating rates in these materials and also to separate out the neutron and gamma heating contributions. The Monte Carlo calculations show that nuclear heating of rhodium is mainly due to neutrons, converting the rhodium gamma thermometer effectively in a neutron thermometer. The sensitivities of the gamma thermometers with W, Mo or Rh as heated materials have been modelled by finite element calculations. It is found that both the Mo and the Rh based sensor have a very linear response up to a nuclear heating of 20 W/g.

Details

Original languageEnglish
Article number04003
Pages (from-to)1-6
Number of pages6
JournalEPJ Web of Conferences
Volume225
DOIs
Publication statusPublished - 22 Jan 2020
Event2019 - ANIMMA - Advancements in Nuclear Instrumentation Measurement Methods and their Applications: International conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications - Grand Hotel Bernardin, Portoroz, Slovenia
Duration: 17 Jun 201921 Jun 2019
http://www.animma.com/

Keywords

  • Nuclear measurements, Gamma-ray, detectors

ID: 6745676