Individual neutron monitoring in workplaces with mixed neutron/photon radiation

Abstract

EVIDOS (`evaluation of individual dosimetry in mixed neutron and photon radiation ®elds') is an European Commission (EC)-sponsored project that aims at a signi®cant improvement of radiation protection dosimetry in mixed neutron/photon ®elds via spectrometric and dosimetric investigations in representative workplaces of the nuclear industry. In particular, new spectrometry methods are developed that provide the energy and direction distribution of the neutron¯uence from which the reference dosimetric quantities are derived and compared to the readings of dosemeters. The ®nal results of the project will be a comprehensive set of spectrometric and dosimetric data for the workplaces and an analysis of the performance of dosemeters, including novel electronic dosemeters. This paper gives an overview of the project and focuses on the results from measurements performed in calibration ®elds with broad energy distributions (simulated workplace ®elds) and on the ®rst results from workplaces in the nuclear industry, inside a boiling water reactor and around a spent fuel transport cask.

2-D Gem-Based Tepc for Neutron Protection Dosimetry

“…For personal dosimeters the requirements are more restrictive. There are 2 different types of personal dosimeters that are attached to the body [1]: (i) passive recording dosimeters and (ii) active alarm dosimeters that respond in real time.…”

Electronic neutron personal dosemeters: their performance in mixed radiation fields in nuclear power plants

“…Figure 2. Spectral neutron fluence per logarithmic binwidth as a function of energy at workplaces investigated at Krü mmel using BSs (dotted line) (1,2) and the directional spectrometer with silicon detectors (full line, MAXED unfolding with pre-information taken from BSs). E values show smaller changes with respect to direction.…”

“…Radiation Fields', see recent overviews (1)(2)(3) ], a series of new electronic neutron personal dosemeters and some passive ones have been irradiated at the nuclear power plant at Krü mmel in Germany. Places that are routinely visited for control measurements were chosen: a position in the control rod room underneath the reactor, another position near the top of the reactor and two places near a cask containing used fuel.…”

Evaluation of individual monitoring in mixed neutron/photon fields: mid-term results from the EVIDOS project

“…The behaviour of the personal and area dosemeters in CANEL and SIGMA has been described previously (9) . At CANEL and SIGMA, the dosemeters Aloka PDM-313 and Siemens EPD N2 showed over-readings by more than a factor of two compared with the reference values, while others (Saphydose-n, DOS-2002, PADC track detectors from NRPB and devices based on superheated drop detectors like HpSLAB and BD-PND) showed deviations of <30%.…”