{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T15:34:06Z","timestamp":1756308846907},"reference-count":22,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2023,10,10]],"date-time":"2023-10-10T00:00:00Z","timestamp":1696896000000},"content-version":"vor","delay-in-days":2169,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2017,11,20]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Objectives<\/jats:title>\n                  <jats:p>Nanoparticles (NPs), including hazardous substances, are generated in crematoriums due to the high temperatures during the combustion process. NPs are reported to greatly impact animals\u2019 health by reaching the alveoli and being carried to the entire body through the blood stream. However, studies in crematoriums have yet to assess workers\u2019 exposure to the generated NPs. The purpose of this study is to assess workers\u2019 exposure to NPs released in crematoriums.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>Field surveys were conducted in three crematoriums with an emphasis on cremation, bone rearrangement and cleaning processes. The NP concentrations and size distributions were analyzed. The deposition of NPs in each respiratory region during each working process was calculated based on the measured data using the Human Respiratory Tract Model.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The mean particle number concentration was maximized momentarily during the bone rearrangement process. The concentration at the time a crematory\u2019s door was opened was 500,000 particle\/cm3. NPs aggregated to micro-sized particles within a few minutes, dust generated by the bone rearrangement, or both. As a result of model calculation, the mean ratios (alveolar per the other regions by a crematory) were approximately 3.0 (bronchus and bronchioles regions: except for the first survey in crematorium A which had the obstruction of measurement) and 4.3 (extrathoracic airways). The ratios were similar for all crematoriums.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>These results can be used for health risk assessments in crematoriums. In addition, these results should be applicable to estimate the inhalation unit risk of each respiratory organ such as lungs and nose.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1539\/joh.17-0008-fs","type":"journal-article","created":{"date-parts":[[2017,10,6]],"date-time":"2017-10-06T22:13:37Z","timestamp":1507328017000},"page":"572-580","source":"Crossref","is-referenced-by-count":5,"title":["Measurement of nanoparticle exposure in crematoriums and estimation of respiratory deposition of the nanoparticles by number and size distribution"],"prefix":"10.1093","volume":"59","author":[{"given":"Nobuyuki","family":"Kato","sequence":"first","affiliation":[{"name":"Department of Environmental Engineering, Graduate School of Engineering, Kyoto University , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuto","family":"Mastui","sequence":"additional","affiliation":[{"name":"Agency for Health, Safety and Environment, Kyoto University , 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