Quantification of pure beta spectra in mixed beta gamma fields as part of eye lens dosimetry at CANDU power plants

Bohra, F.; Atanackovic, J.; Byun, S.H.; Hanu, Andrei R.; Laranjeiro, A S

doi:10.1016/j.apradiso.2021.109746

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…In 2015, OPG, Bruce Power and McMaster University initiated a five-year program to assess the need for eye lens dosimetry inside CANDU NPPs (Atanackovic 2018, Hanu 2018, Laranjeiro et al 2020, Bohra et al 2021. The method selected was to make detailed in-situ measurements of gamma-ray and beta source terms using a variety of detectors.…”

Section: Proposed Eye-dose Dosimetry Solutions In Candu Nppsmentioning

confidence: 99%

“…Unfolding the spectra provided the energy-differential particle fluence rates and the application of appropriate fluence rate to dose conversion coefficients then provided the dose to the lens of the eye (Behrens 2017). These measurements showed that when beta fields are present, they include high endpoint energy betas between 1 and 2 MeV (Bohra 2018, Bohra et al 2021. The study also showed that inside boilers and at fuelling machine locations, H p (0.07) could typically exceed H p (3) by one order of magnitude.…”

Section: Proposed Eye-dose Dosimetry Solutions In Candu Nppsmentioning

confidence: 99%

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Current status of eye-lens dosimetry in Canada

Dubeau¹,

Sun²,

Djeffal³

et al. 2022

J. Radiol. Prot.

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For occupational exposures in planned exposure situations International Commission on Radiological Protection (ICRP) publication 118 recommends an equivalent dose limit for the lens of the eye of 20 mSv yr−1 averaged over five years with no single year exceeding 50 mSv. This constitutes a reduction from the previous limit of 150 mSv yr−1. The Canadian nuclear regulator, the Canadian Nuclear Safety Commission, responded to the ICRP recommendation by initiating amendments to the Radiation Protection Regulations through a discussion paper which was published for comment by interested stakeholders in 2013. The revised equivalent dose limit of 50 mSv in a one-year dosimetry period for nuclear energy workers came into effect in January 2021. This paper presents the outcome of discussions with Canadian stakeholders in diverse fields of radiological work which focused on the implementation of the reduced occupational equivalent dose limit for the lens of the eye in their respective workplaces. These exchanges highlighted the existing practices for monitoring doses to the lens of the eye and identified current technological gaps. The exchanges also identified that, in many cases, the lens of the eye dose is anticipated to be well within the new dose limit despite some of the gaps in technology. The paper also presents the monitoring and eye-lens dose assessment solutions that are available based on different methods for eye-lens monitoring; presented together with criteria for their use.

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Section: Proposed Eye-dose Dosimetry Solutions In Candu Nppsmentioning

confidence: 99%