An Improved Method for Estimating the Dose to the Lens of the Eye Using Hp(10) and Hp(0.07) Measurements

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Peri Eyal ◽  
Abraham Adi ◽  
Kravchik Tuvia ◽  
Weinstein Marcelo ◽  
Sattinger Daniel ◽  
...  
Keyword(s):  
New Method ◽  
International Commission ◽  
Radiological Protection ◽  
Improved Method ◽  
Dose Limit ◽  
Routine Monitoring ◽  
Recent Recommendation ◽  
Order Of Magnitude

Recent recommendation, by the International Commission on Radiological Protection (ICRP), to reduce the dose limit to the lens of the eye by almost an order of magnitude, has increased substantially the need to monitor this dose, i.e., Hp(3), with an accurate dosimeter. Since such dosimeter has not yet been validated and fully implemented, present monitoring of the dose to the lens of the eye is based on the measurement of Hp(10) and Hp(0.07) values and using conservative assumptions, which lead to an overestimate of the required dose. A new method to estimate Hp(3) using measured values of Hp(10) and Hp(0.07) has been suggested, which is more accurate and less conservative. This method could be used for routine monitoring and also in cases where there is a need to reconstruct historical doses to the lens of the eye, such as in law court claims of workers that were diagnosed with cataract.

scholarly journals Radiation eye dose to medical staff during respiratory endoscopy under X-ray fluoroscopy

2020 ◽  
Vol 61 (5) ◽  
pp. 691-696
Author(s):  
Yoshihiro Haga ◽  
Koichi Chida ◽  
Yuichiro Kimura ◽  
Shinsuke Yamanda ◽  
Masahiro Sota ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Medical Staff ◽  
International Commission ◽  
Radiological Protection ◽  
Dose Equivalent ◽  
Dose Limit ◽  
Clinical Value ◽  
Correct Evaluation ◽  
X Ray ◽  
The Mean

Abstract Although the clinical value of fluoroscopically guided respiratory endoscopy (bronchoscopy) is clear, there have been very few studies on the radiation dose received by staff during fluoroscopically guided bronchoscopy. The International Commission on Radiological Protection (ICRP) is suggesting reducing the occupational lens dose limit markedly from 150 to 20 mSv/year, averaged over defined periods of five years. The purpose of this study was to clarify the current occupational eye dose of bronchoscopy staff conducting fluoroscopically guided procedures. We measured the occupational eye doses (3-mm-dose equivalent, Hp(3)) of bronchoscopy staff (physicians and nurses) over a 6-month period. The eye doses of eight physicians and three nurses were recorded using a direct eye dosimeter, the DOSIRIS. We also estimated eye doses using personal dosimeters worn at the neck. The mean ± SD radiation eye doses (DOSIRIS) to physicians and nurses were 7.68 ± 5.27 and 2.41 ± 1.94 mSv/6 months, respectively. The new lens dose limit, 20 mSv/year, may be exceeded among bronchoscopy staff, especially physicians. The eye dose of bronchoscopy staff (both physicians and nurses) was underestimated when measured using a neck dosimeter. Hence, the occupational eye dose of bronchoscopy staff should be monitored. To reduce the occupational eye dose, we recommend that staff performing fluoroscopically guided bronchoscopy wear Pb glasses. correct evaluation of the lens dose [Hp(3)] using an eye dosimeter such as the DOSIRIS is necessary for bronchoscopy staff.

ELECTRON EYE-LENS OPERATIONAL DOSE COEFFICIENTS

2020 ◽  
Vol 188 (3) ◽  
pp. 372-377
Author(s):  
J Dubeau ◽  
J Sun
Keyword(s):  
Electron Transport ◽  
International Commission ◽  
Eye Lens ◽  
Radiological Protection ◽  
Electron Radiation ◽  
Dose Limit ◽  
Eye Lens Dose ◽  
Beta Emitters ◽  
The Face ◽  
Dose Coefficients

Abstract In 2012, the International Commission on Radiological Protection issued a recommendation for a reduced annual eye-lens dose limit in the face of mounting evidence of the risk of cataract induction. This led to worldwide research efforts in various areas including the dose simulation in realistic eye-models, the production of dosimeters and the elaboration of protection and operation fluence to eye-lens dose coefficients. In this last case, much efforts have been expanded with regards to photon operational coefficients for Hp (3) but much less for electron radiation. In this work, Hp (3) coefficients for electrons are presented following simulations using MCNP and compared to those that are available in the literature. It is found that, at energies of 1 MeV and less, Hp (3) coefficients depend strongly on the selected electron transport options and on the dose tally volume. The effect of these differences is demonstrated for two beta emitters.

MINIMIZING THE EXPOSURE TO THE EYE LENS OF RADIOLOGIC TECHNOLOGISTS ASSISTING PATIENTS DURING CHEST X RAYS: A PHANTOM STUDY

2021 ◽  
Vol 193 (1) ◽  
pp. 43-54
Author(s):  
Yasuda Mitsuyoshi ◽  
Funada Tomoya ◽  
Sato Hisaya ◽  
Kato Kyoichi
Keyword(s):  
Radiation Protection ◽  
Phantom Study ◽  
International Commission ◽  
Eye Lens ◽  
Radiological Protection ◽  
X Rays ◽  
Radiologic Technologists ◽  
Maximum Reduction ◽  
The Right

Abstract As chest x rays involve risks of patients falling, radiologic technologists (technologists) commonly assist patients, and as the assistance takes place near the patients, the eye lenses of the technologists are exposed to radiation. The recommendations of the International Commission on Radiological Protection suggest that the risk of developing cataracts due to lens exposure is high, and this makes it necessary to reduce and minimize the exposure. The present study investigated the positions of technologists assisting patients that will minimize exposure of the eye lens to radiation. The results showed that it is possible to reduce the exposure by assisting from the following positions: 50% at the sides rather than diagonally behind, 10% at the right side of the patient rather than the left and 40% at 250 mm away from the patient. The maximum reduction with radiation protection glasses was 54% with 0.07 mmPb and 72% with 0.88 mmPb.

Improved Method Based on Fluid Mechanics Analysis for Buoy Gauge Design and Experimental Research

2012 ◽  
Vol 163 ◽  
pp. 133-137
Author(s):  
Ao Yu Chen ◽  
Xu Dong Pan ◽  
Guang Lin Wang
Keyword(s):  
Fluid Mechanics ◽  
Experimental Research ◽  
Traditional Method ◽  
New Method ◽  
Improved Method ◽  
Advanced Method ◽  
Inner Surface ◽  
Mechanics Analysis ◽  
Linear Property

Traditional method of buoy gauge design is rather complicated, so an advanced method by building and solving fluid mechanics equations is proposed in this paper. The curve of the taper pipe inner surface is calculated, according to different buoy gravity and diameter. In order to examine the effect of this improved method, an experiment is carried out. Results show that linear property of the buoy gauge improved by new method is excellent.

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