Monitoring of eye lens doses in radiation protection

Bordy, Jean-Marc

doi:10.1051/radiopro/2015009

Cited by 6 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…H p (10) or H p (0.07)) to H p (3). An example of such an analysis was presented by Bordy (2015Bordy ( , 2017. The author considered the example of using H p (10), measured with a whole-body dosimeter, as a surrogate method of estimating H p (3).…”

Section: Guidance On Assessing the Eye-lens Dosementioning

confidence: 99%

Current status of eye-lens dosimetry in Canada

Dubeau¹,

Sun²,

Djeffal³

et al. 2022

J. Radiol. Prot.

View full text Add to dashboard Cite

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.

show abstract

Section: Guidance On Assessing the Eye-lens Dosementioning

confidence: 99%

Current status of eye-lens dosimetry in Canada

Dubeau¹,

Sun²,

Djeffal³

et al. 2022

J. Radiol. Prot.

View full text Add to dashboard Cite

show abstract

“…Half of the countries in the survey had issued guidelines addressing aspects of eye lens monitoring (IRSN Rapport 2013, CNSC 2016). Among the documents, already produced and made available for the RP community, there are: a factsheet launched by an association, to inform industrial users of the changes, including advice on monitoring and the use of protective equipment (ARPANSA 2015); publications, in the form of documents and articles, by members of a dedicated Working Group from an association, reporting operational indications in interventional radiology procedures with a focus on optimisation (Compagnone et al 2018); an ongoing web area of frequently asked questions, with particular attention paid to changes in the equivalent dose limit for the lens and research on eye dose monitoring; recommendations provided by four associations are dedicated to good practice for different groups of workers in view of the new limit for the lens, including guidelines for implementation of medical surveillance, and in some cases, direct distribution of the documents to monitored workers (SFRP 2016); a guidance document produced by one association stresses the principle of keeping staff doses ALARP through the hierarchy of control measures; articles and documents, prepared by a dedicated member of an association, on monitoring giving an updated view about the use of an indirect evaluation of H p (3), through H p (10), to avoid underestimations (Bordy 2018). Other countries report that guidelines are under preparation, e.g.…”

Section: Topic 4: Legislation and Other General Aspectsmentioning

confidence: 99%

Report of IRPA task group on issues and actions taken in response to the change in eye lens dose limit

et al. 2020

View full text Add to dashboard Cite

In 2018, the International Radiation Protection Association (IRPA) established its third task group (TG) on the implementation of the eye lens dose limit. To contribute to sharing experience and raising awareness within the radiation protection community about protection of workers in exposure of the lens of the eye, the TG conducted a questionnaire survey and analysed the responses. This paper provides an overview of the results of the questionnaire.

show abstract

“…Radiation-induced cataracts dose limit model is a deterministic non-threshold model, which means that cataracts can even occur without a radiation dose [3] . Moreover, recent epidemiological studies suggest that radiation-induced cataract occurs if less than 0.5 Gy is deposited in the lens [1][2][3][4] . The EL dose limit drawn by the International Commission for Radiation Protection (ICRP) used to be 150 mSv/y, in 2012 and then it was reduced to 20 mSv/y, averaged over 5 years with no single year exceeding 50 mSv [2] .…”

Section: Introductionmentioning

confidence: 99%

“…EL dose is clinically measured by (3) dosimeters, which are by far the most accurate for this purpose, because of their function to measure the dose at 3 mm depth [4] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

GAMOS DICOM Simulation on Occupational EL Dose due to 99mTc and 131I Exposures in Nuclear Medicine Departments

Rajkhan¹

2019

JKAU Earth Sci

View full text Add to dashboard Cite

Radiation induced cataracts is a disease that is common amongst radiation exposed staff. About 30 percent of retired occupational radiation workers developed eye lens (EL) cataracts. Epidemiological studies on radiation therapy patients, occupational workers, and atomic bomb survivors show that 0.5 Gy of acute or fractioned radiation dose to EL causes one or both lens to cloud. The annual EL dose limit drawn by the International Commission for Radiation Protection (ICRP) was 150 mSv and was changed in 2012 to 20 mSv averaged over 5 years, with no single year exceeding 50 mSv. The limited number of researche done in Nuclear Medicine (NM) clinics with the Hp(3) dosimeters suggest that the annual EL dose from three procedures is measured to be between 4.5 and 9 mSv (i.e. dispensing, preparing and administering). These procedures are performed when the radioactive materials are in closed shielded containers or behind a barrier. Common radioactive material handled by occupational workers in NM clinics are 99mTc and 131I. They pose less radiation hazard to workers EL in the three procedures when they are behind shielded containers. Moreover, once the radioactive material is administered into patients, they become open sources and pose more radiation hazard to workers. The Hp(3) dosimeter is a new uncommon dosimeter. Many radiation facilities use the Hp(0.07) and Hp(10) dosimeters coupled with many conditions and conversion factors to find approximate results. Therefore, simulations are performed to find the EL dose. However, some simulations are performed with little flexibility in simulation geometry, others utilize low-quality phantoms or present the simulation results in terms of fluxes or energy ranges. In the present study, the NM worker EL dose is simulated by utilizing a high-resolution Digital Imagning Communication in Medicine (DICOM) image in GEANT4 Archeticture for Medical Oriented Simulation (GAMOS). A water cylinder homogenously filled by radioactive material, representing the administered patient, was created in the simulation. The worker exposure scenario was simulated by placing the cylinder in three different directions and five different distances with respect to the DICOM image. The results of the simulation reveal that the highest occupational EL radiation dose is received from the anterior-posterior direction, followed by the lateral, and the posterior-anterior directions. The results of the conservative simulated scenario reveal that the worker EL dose is exposed to three tenths of the annual dose limit after 110 131I patients, or 300 99mTc patients.

show abstract

Monitoring of eye lens doses in radiation protection

Cited by 6 publications

References 9 publications

Current status of eye-lens dosimetry in Canada

Current status of eye-lens dosimetry in Canada

Report of IRPA task group on issues and actions taken in response to the change in eye lens dose limit

GAMOS DICOM Simulation on Occupational EL Dose due to 99mTc and 131I Exposures in Nuclear Medicine Departments

Contact Info

Product

Resources

About