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Nakagawa, Masahiro; Nojima, Shun; Fujii, Katsutoshi; Shishido, Nobuhito; Sakai, Toshiya; Umehara, Takashi; Shimizu, Isamu
Hoken Butsuri, 47(3), p.189 - 193, 2012/10
It is essential to wear an air-purifying respirator in the radiation works in a contaminated atmosphere. A breath-responsive-powered air-purifying respirator (BR-PAPR) has been recently developed. However, no research has yet been conducted to determine the protection factor (PF) of the BR-PAPR in actual workplaces. In this study, the PFs of the BR-PAPR were measured by a man-test apparatus and compared with those of a non-powered full face mask. The PFs were measured under three different situations; normal wearing condition, clogging the filter and leaving a gap between the face and the mask. Under these situations, it was found that the PFs of the BR-PAPR are higher than those of the non-powered full face mask. PFs greater than 4000 were obtained for 95% of the subjects who wear the BR-PAPR, and PFs over 6667, the upper limit of the man-test apparatus, were obtained for 49% of them. The questionnaire survey was conducted for workers. The results showed that the workers feel a reduced burden when they wear the BR-PAPR. The results of this study showed high protection performance and operation efficiency of the BR-PAPR.
Yoshitomi, Hiroshi; Pangsub, K.; Hoshi, Shintaro; Takahashi, Teruhiko; Shishido, Nobuhito; Onodera, Junichi
no journal, ,
Workers to put full-face mask have checked their protection factors (PFs) by mask-man test apparatus before their works in the Reactor Fuel Examination Facility (RFEF) of JAEA. Analyzing these data, we could fit the distribution of the PFs for the inexperienced workers to the hybrid lognormal distribution. On the other hand, those of the experienced workers could be fitted to the lognormal distribution whose average was about 3000. If the PF is less than 200, then the worker have to check his mask-fit and retry to measure. Taking into account of the result of the retrial, we could also fit them to the lognormal distribution whose average was about 2000 even in those of the inexperienced workers. Next, we tried to correlate PF with BMI (Body Mass Index) to evaluate the individual PFs easily. As a result, we obtained the correlation coefficient is 0.5. In conclusion, we can tentatively say that if the workers have considerable experience using mask-man test apparatus, to put full-face mask can prevent them from inhalation of the radioactive dust about 2000 times more, and moreover we can estimate the individual PFs from their BMIs to some extent.
Fujii, Katsutoshi; Takahashi, Teruhiko; Saegusa, Jun; Shishido, Nobuhito; Mochizuki, Kaoru*; Nojima, Shun; Akiyama, Isamu; Shimizu, Isamu
no journal, ,
In NSRR, pulse operation is performed. The correction of counting-loss is needed under the condition that large amount of neutrons have detected in a short period of time. This time, counting-loss of the neutron survey meter(type NSN1) is estimated used for monitoring Burst neutrons at NSRR.
Nakagawa, Masahiro; Nojima, Shun; Fujii, Katsutoshi; Shishido, Nobuhito; Sakai, Toshiya; Umehara, Takashi; Shimizu, Isamu
no journal, ,
no abstracts in English
Kikuchi, Masamitsu; Umehara, Takashi; Shishido, Nobuhito; Kuramochi, Akihiko; Fujii, Katsutoshi; Nakajima, Junya
no journal, ,
no abstracts in English
Nakagawa, Masahiro; Kato, Takuya; Nojima, Shun; Sakai, Toshiya; Shishido, Nobuhito; Umehara, Takashi
no journal, ,
Mask fitting tester "MT-03" is widespread as educational equipment in medical institution and industrial organization. However, there are few examples introduced in order to check the protection performance of purifying respirators in nuclear facilities. In this study, we compared protection factors obtained by MT-03 and those obtained by Mask-man test apparatus "MT-100N". As a result, although the change of measurement result is larger and measured value is higher than that of MT-100N, it was found that protection performance can be checked appropriately.
Nojima, Shun; Sakai, Jun; Nakagawa, Masahiro; Shirato, Yoshihiro; Aoyagi, Hiroyuki; Otsuka, Yoshikazu; Sakai, Toshiya; Shishido, Nobuhito; Umehara, Takashi
no journal, ,
no abstracts in English
Furutani, Misa; Aoyagi, Hiroyuki*; Shirato, Yoshihiro; Nojima, Shun; Nakagawa, Masahiro; Otsuka, Yoshikazu; Niinuma, Shinichi*; Sakai, Toshiya; Muto, Yasushi; Nanri, Tomohiro; et al.
no journal, ,
no abstracts in English
Arakawa, Yuto; Fujii, Katsutoshi; Mimura, Ryuji; Nakashio, Nobuyuki; Onuma, Isamu; Shishido, Nobuhito; Umehara, Takashi
no journal, ,
no abstracts in English
Nakajima, Junya; Yamada, Katsunori; Yokoyama, Hiroya; Shishido, Nobuhito; Muto, Yasushi
no journal, ,
We implement C-14 monitoring of exhaust in such a way as to measure mono-ethanolamine which is a collector of 
CO
with a liquid scintillation counter. Since Aquasol-2, which we have used so far was finished selling, we have done technical examinations on Insta-Gel plus and Ultima Gold for the alternative cocktail of Aquasol-2. In the result, as for the both cocktails, we confirmed that mono-ethanolamine can merge into the cocktails with some chemical additive, and detection limits of C-14 can comply the law limit of C-14 concentration of exhaust. However, chemical luminescence of Ultima Gold was so intense that it might affect the measurement in the case of measuring H-3 at the same time. Because of this, we chose Insta-Gel plus as the alternative cocktail.
