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Evaluation of the occupational doses of interventional radiologists.

Kuipers G, Velders XL, de Winter RJ, Reekers JA, Piek JJ - Cardiovasc Intervent Radiol (2008)

Bottom Line: The doses above and under the protective aprons of seven radiologists did not differ significantly.There is no evidence that the effective dose can be estimated more accurately when an additional dosimeter is used.Due to the threshold it can be concluded that the doses under the lead apron will not be underestimated easily when doses above the lead apron are used to calculate them.

View Article: PubMed Central - PubMed

Affiliation: Radiation Protection Group, Academic Medical Center, Meibergdreef 9, Amsterdam, 1105 AZ, The Netherlands. g.kuipers@amc.uva.nl

ABSTRACT
The aim of the present study was to determine whether there is a linear relation between the doses measured above and those measured under the lead apron of the radiologists performing interventional procedures. To monitor radiation exposure the International Commission of Radiological Protection (ICRP) recommends the use of a single dosimeter under the protective apron. To determine the exposure more accurately an additional dosimeter is recommended above the protective apron. The exposure of eight radiologists was monitored with two personal dosimeters during 3 consecutive years. To measure the doses uniformly the two dosimeters were worn in a special holder attached to the lead apron. The two personal dosimeters were replaced every 4 weeks on the same day. The doses above and under the protective aprons of seven radiologists did not differ significantly. A significant lower dose above and under the protective apron was measured for one of the radiologists. During a 4-week period the average dose measured above the lead apron was 3.44 mSv (median, 3.05 mSv), while that under the 0.25-mm lead apron was 0.12 mSv (median, 0.1 mSv). The coefficients of the regression line result in the equation Y = 0.036X-0.004, with Y as the dose under the lead apron and X as the dose above the lead apron. The statistical analysis of the data established a linear relation between the doses above and those under the lead apron (R(2) = 0.59). Before the special holder was introduced it was not possible to derive a relation between the doses above and those under the lead apron, as the doses were measured at varying places above and under the lead apron. There is no evidence that the effective dose can be estimated more accurately when an additional dosimeter is used. The present study revealed a threshold before doses under the lead apron were measured. Due to the threshold it can be concluded that the doses under the lead apron will not be underestimated easily when doses above the lead apron are used to calculate them. This is not the case when the doses above the lead apron are calculated for the doses under the lead apron.

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Plot of doses (mSv) measured above the lead apron (X-axis) and under the lead apron (Y-axis). The line represents the equation for the regression
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Fig5: Plot of doses (mSv) measured above the lead apron (X-axis) and under the lead apron (Y-axis). The line represents the equation for the regression

Mentions: In Fig. 5 the doses measured under the lead apron are plotted against the doses above the lead apron. The statistical analysis of the data established a linear relation between the doses above and those under the lead apron (ANOVA, p < 0.05, R2 = 0.59). The coefficients of the regression line representing the relation between the doses measured above and those measured under the leaded apron were derived, resulting in the equation Y = 0.036X − 0.004, with Y as the dependent variable (dose under the lead apron) and X as the predictor value (dose above the lead apron). The 95% confidence interval for the coefficients ranged from 0.034 to 0.038. The standard error of the models tested was 0.07. The standard error of the model was lower than the standard deviation of the average dose under the lead apron (0.11). The residuals were normally distributed (p > 0.05) (Fig. 6).Fig. 5


Evaluation of the occupational doses of interventional radiologists.

Kuipers G, Velders XL, de Winter RJ, Reekers JA, Piek JJ - Cardiovasc Intervent Radiol (2008)

Plot of doses (mSv) measured above the lead apron (X-axis) and under the lead apron (Y-axis). The line represents the equation for the regression
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2367387&req=5

Fig5: Plot of doses (mSv) measured above the lead apron (X-axis) and under the lead apron (Y-axis). The line represents the equation for the regression
Mentions: In Fig. 5 the doses measured under the lead apron are plotted against the doses above the lead apron. The statistical analysis of the data established a linear relation between the doses above and those under the lead apron (ANOVA, p < 0.05, R2 = 0.59). The coefficients of the regression line representing the relation between the doses measured above and those measured under the leaded apron were derived, resulting in the equation Y = 0.036X − 0.004, with Y as the dependent variable (dose under the lead apron) and X as the predictor value (dose above the lead apron). The 95% confidence interval for the coefficients ranged from 0.034 to 0.038. The standard error of the models tested was 0.07. The standard error of the model was lower than the standard deviation of the average dose under the lead apron (0.11). The residuals were normally distributed (p > 0.05) (Fig. 6).Fig. 5

Bottom Line: The doses above and under the protective aprons of seven radiologists did not differ significantly.There is no evidence that the effective dose can be estimated more accurately when an additional dosimeter is used.Due to the threshold it can be concluded that the doses under the lead apron will not be underestimated easily when doses above the lead apron are used to calculate them.

View Article: PubMed Central - PubMed

Affiliation: Radiation Protection Group, Academic Medical Center, Meibergdreef 9, Amsterdam, 1105 AZ, The Netherlands. g.kuipers@amc.uva.nl

ABSTRACT
The aim of the present study was to determine whether there is a linear relation between the doses measured above and those measured under the lead apron of the radiologists performing interventional procedures. To monitor radiation exposure the International Commission of Radiological Protection (ICRP) recommends the use of a single dosimeter under the protective apron. To determine the exposure more accurately an additional dosimeter is recommended above the protective apron. The exposure of eight radiologists was monitored with two personal dosimeters during 3 consecutive years. To measure the doses uniformly the two dosimeters were worn in a special holder attached to the lead apron. The two personal dosimeters were replaced every 4 weeks on the same day. The doses above and under the protective aprons of seven radiologists did not differ significantly. A significant lower dose above and under the protective apron was measured for one of the radiologists. During a 4-week period the average dose measured above the lead apron was 3.44 mSv (median, 3.05 mSv), while that under the 0.25-mm lead apron was 0.12 mSv (median, 0.1 mSv). The coefficients of the regression line result in the equation Y = 0.036X-0.004, with Y as the dose under the lead apron and X as the dose above the lead apron. The statistical analysis of the data established a linear relation between the doses above and those under the lead apron (R(2) = 0.59). Before the special holder was introduced it was not possible to derive a relation between the doses above and those under the lead apron, as the doses were measured at varying places above and under the lead apron. There is no evidence that the effective dose can be estimated more accurately when an additional dosimeter is used. The present study revealed a threshold before doses under the lead apron were measured. Due to the threshold it can be concluded that the doses under the lead apron will not be underestimated easily when doses above the lead apron are used to calculate them. This is not the case when the doses above the lead apron are calculated for the doses under the lead apron.

Show MeSH
Related in: MedlinePlus