scispace - formally typeset
Search or ask a question
Author

Susan Hunter Youngren

Bio: Susan Hunter Youngren is an academic researcher. The author has contributed to research in topics: Exposure assessment & Probabilistic logic. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the authors present a probabilistic exposure assessment of operator and residential non-dietary exposure, in which the risk assessor characterizes the variability in the assessment as a characterization of both uncertainty and variability.
Abstract: There are several challenges in the area of probabilistic exposure assessment of operator and residential non-dietary exposure: the proper uses of the available data and how to adequately understand and characterize the uncertainty in the assessment. The adequacy of the data can be assessed either qualitatively or quantitatively. If a qualitative assessment were deemed acceptable, then expert judgement would be the primary methodology. However, in most instances a quantitative assessment of adequacy will be possible and will provide more pertinent information. In that case statistical techniques should be used. Understanding and characterizing uncertainty is a separate challenge, which is often ignored. Instead risk assessors present characterizing the variability in the assessment as a characterization of both uncertainty and variability. This can lead to misinterpretation of the outputs of the assessment. Interpretation of outputs can be discussed on two levels — familiarizing the risk managers and the policy makers with the types of outputs resulting from a probabilistic assessment (graphs and/or matrices of values) as well as explaining the meanings and implications of the values. The burden is placed on the assessor to clearly reflect to the risk managers and policy makers the way on which variability and uncertainty were handled in the assessment. In advising the risk managers and policy makers, it is important to remind them of the purpose of conducting a probabilistic risk assessment: the probabilistic assessment allows a means to characterize the degrees of uncertainty and variability in terms of probabilities.

2 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, a revisao critica das principais metodologias utilizadas for quantificacao da exposicao dermica, com o objetivo de ressaltar a importância da discussao sobre o assunto e de evidenciar a necessidade de acoes that contribuam for o estabelecimento de uma metodology unica for a quantificacião da exosica-de-dermica de trabalhadores rurais.
Abstract: A quantificacao da exposicao dermica a agrotoxicos, utilizada no processo de avaliacao do risco a saude de trabalhadores rurais, pode ser realizada usando-se diferentes metodologias, como patches ou corpo total. A existencia de diversos metodos pode ser considerada uma limitacao relacionada ao processo, ja que podem nao produzir resultados similares devido as diferenciacoes nos principios envolvidos na coleta das amostras. Dessa maneira, realizou-se uma revisao critica das principais metodologias utilizadas para a quantificacao da exposicao dermica, com o objetivo de ressaltar a importância da discussao sobre o assunto e de evidenciar a necessidade de acoes que contribuam para o estabelecimento de uma metodologia unica para a quantificacao da exposicao dermica de trabalhadores rurais. Entende-se que a harmonizacao das metodologias contribuira para o alcance de condicoes mais seguras e saudaveis de trabalho, principalmente por possibilitar a obtencao de resultados mais confiaveis e, portanto, estabelecer, garantir e aprimorar o processo de prevencao de agravos a saude do trabalhador.

8 citations

Journal ArticleDOI
TL;DR: Although Va was found with great variation for the chamber specified in the low thermal impact condition, the exposure chamber studied can still be regarded as a feasible one for assessing workers’ thermal hazard.
Abstract: This study was conducted on a thermal exposure chamber designed for assessing workers' thermal hazard In order to assess the efficacy of the studied chamber, three environmental conditions were selected to simulate high, middle and low thermal impact situations, with air temperatures (Ta) of 4312, 3623 and 2577 masculine C, globe temperatures (Tg) of 4441, 4107 and 2924 masculine C, relative humidity (RH) of 77, 59 and 39%, and air flow velocities (Va) of 170, 091 and 025 m/s, respectively For the three specified thermal impact conditions, results show that the coefficients of variation (CVs) for Ta, Tg, RH and Va measured in the chamber studied were consistently less than 10%, except for Va under the low thermal impact condition (=50%) For each specified thermal impact condition, we generated 1,000 environmental combinations by using the Monte Carlo simulation approach according to the variations obtained from the four environmental factors We directly adopted the ISO 7933 approach to estimate the allowable exposure time (AET) for each simulated environmental condition This study yielded a range in the 95% confidence interval (95% CI) of the estimated AETs for the three specified thermal impact conditions which were consistently less than 5 min We further conducted the sensitivity analysis to examine the effect of the four environmental factors on estimating AETs We found Va was the least important factor in estimating AETs for any specified thermal impact condition In conclusion, although Va was found with great variation for the chamber specified in the low thermal impact condition, the exposure chamber studied can still be regarded as a feasible one for assessing workers' thermal hazard

2 citations