Collection efficiency and decontamination factor of HEPA filter.

DOI 4 Citations
  • YAMADA Yuji
    Division of Comparative Radiotoxicology, National Institute of Radiological Sciences
  • MIYAMOTO Katsuhiro
    Division of Comparative Radiotoxicology, National Institute of Radiological Sciences
  • Koizumi Akira
    Division of Comparative Radiotoxicology, National Institute of Radiological Sciences

Bibliographic Information

Other Title
  • ＨＥＰＡフィルタの捕集効率と除染係数

Description

It is very important in a nuclear air cleaning system that HEPA (High Efficiency Particulate Air) filter is for reduction of releasing amounts of airborne radioactive particles. HEPA filter, by definition, has a minimum collection efficiency of 99.97% for 0.3μm particles. However, DF (Decontamination Factor), which is necessary for safety management, can not be directly derived from the efficiency. And the current standard defined for 0.3μm particles has no scientific justification, because it has been found that the most penetrating particle size through HEPA filter is not always 0.3μm.<br>In the present paper, a numerical experiment was made in order to estimate a relationship between DF and the efficiency. And new standard, in which the minimum DF is able to be easily obtained, was proposed. In the multistage filtration system, it was found that lower values of DF was possible to be experimentally indicated in the second and the third stages, even if the collection performance of the each filter is the same.

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Details 詳細情報について

  • CRID
    1390282679266392320
  • NII Article ID
    130000793103
  • DOI
    10.5453/jhps.21.237
  • COI
    1:CAS:528:DyaL2sXit1agurw%3D
  • ISSN
    18847560
    03676110
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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