Radioactive contamination mapping of northeastern and eastern Japan by a car-borne survey system, Radi-Probe

Kobayashi, Shingo; Shinomiya, Takayuki; Kitamura, Hisashi; Ishikawa, Takahiro; Imaseki, Hitoshi; Oikawa, Masakazu; Kodaira, Satoshi; Miyaushiro, Norihiro; Takashima, Yoshio; Uchihori, Y.

doi:10.1016/j.jenvrad.2014.07.026

Cited by 27 publications

(20 citation statements)

References 14 publications

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“…Both systems have been used in several projects to establish radiation dose rate maps by the Fukushima Prefectural Government and the Ministry of Education, Culture, Sports, Science and Technology of Japan. Radi-Probe [3], a system developed by the National Institute of Radiological Sciences, uses a HPGe detector and CsI(Tl) detector. Radi-Probe is capable of measuring energy spectra with good energy resolution, the surface deposition density of radionuclides, and the air dose rate.…”

Section: Comparison Of Measured Bishamon Data With Those Of Other Sysmentioning

confidence: 99%

“…Using vehicle-mounted and on-foot survey methods, BISHAMON concurrently measures the ambient dose equivalent rates along with precise geographic coordinates, allowing for the creation of maps that inform on the presence of radiation in the affected communities. In this study, we give an overview of BISHAMON and its measurement results including a comparison with the results of KURAMA [1,2], Radi-Probe [3], and Safecast [4].…”

Section: Introductionmentioning

confidence: 99%

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Development of a Portable Gamma-ray Survey System for the Measurement of Air Dose Rates

Goto¹,

Shobugawa²,

Kawano³

et al. 2016

Proceedings of International Symposium on Radiation Detectors and Their Uses (ISRD2016)

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BIo-Safety Hybrid Automatic MOnitor-Niigata (BISHAMON), a portable gamma-ray survey system, was developed to support victims of the Fukushima Daiichi nuclear disaster. BISHAMON is capable of constructing a map of the distribution of ambient dose equivalent rates using vehicle-mounted or on-foot survey methods. In this study, we give an overview of BISHAMON and its measurement results including a comparison with those of other systems such as KURAMA.

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Section: Comparison Of Measured Bishamon Data With Those Of Other Sysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a Portable Gamma-ray Survey System for the Measurement of Air Dose Rates

Goto¹,

Shobugawa²,

Kawano³

et al. 2016

Proceedings of International Symposium on Radiation Detectors and Their Uses (ISRD2016)

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“…Pembuatan SOP untuk penanganan bahaya radiasi sebagai persyaratan bekerja pada zona daerah radiasi dengan membuat beberapa SOP antara lain: SOP pelarutan, SOP transfer, SOP pemisahan isotop 137 Cs di dalam PEB U3Si2-Al pasca iradiasi dan SOP proses proses loading padatan 137 Cszeolit ke dalam inner capsule stainless steel [13] [12] .…”

Section: A Pembuatan Standar Operasi Prosedur (Sop)unclassified

PEMBUATAN SUMBER RADIASI GAMMA 137Cs DENGAN AKTIVITAS 20 mCi DARI PEB U3Si2-Al PASCA IRADIASI DALAM CONTAINER STAINLESS STEEL

Ginting

Yanlinastuti

Noviarty

et al. 2016

urania

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ABSTRAK PEMBUATAN SUMBER RADIASI GAMMA ISOTOP 137 Cs DENGAN AKTIVITAS 20 mCi DARI PEB U3Si2-Al PASCA IRADIASI DALAM CONTAINER STAINLESS STEEL. Kegiatan uji pasca iradiasi pelat elemen bakar (PEB) U3Si2-Al banyak menghasilkan larutan dengan keaktifan yang sangat tinggi. Larutan tersebut mengandung isotop 137 Cs, uranium serta transuranium yang mempunyai waktu paroh panjang dan berbahaya bagi lingkungan. Namun larutan tersebut memiliki nilai ekonomis tinggi karena dapat dimanfaatkan sebagai bahan baku untuk pembuatan sumber radiasi sinar gamma isotop 137 Cs. Hal ini dapat membantu bidang industri dalam memenuhi kebutuhan sumber radioaktif dalam negeri karena selama ini kebutuhan isotop 137 Cs di Indonesia masih tergantung dari industri luar negeri. Selain itu, pengadaan dan transportasi isotop 137 Cs dari luar negeri serta dalam penggunaannya memerlukan persyaratan yang cukup ketat dari Badan Pengawas Tenaga Nuklir Nasional (BAPETEN), sehingga menyebabkan harga isotop 137 Cs menjadi mahal sampai di Indonesia. Dengan alasan tersebut, BATAN sebagai lembaga litbang nuklir di Indonesia perlu mempelajari pembuatan sumber radiasi gamma isotop 137 Cs dari larutan hasil pengujian bahan bakar nuklir U3Si2-Al pasca iradiasi. Manfaat isotop 137 Cs sangat luas antara lain digunakan dalam menganalisis sampel lingkungan, industri migas, konstruksi, radiografi, perikanan, rumah sakit dan pertambangan. Pembuatan sumber radiasi gamma isotop 137 Cs dimulai dari pengumpulan larutan hasil pengujian PEB U3Si2-Al. Larutan larutan hasil pengujian mengandung isotop 137 Cs dan isotop lainnya dikumpulkan menjadi satu dalam botol dengan volume 65 mL. Pemisahan isotop 137 Cs dari hasil fisi lainnya dilakukan dengan metode penukar kation menggunakan zeolit Lampung dengan berat 45 gr. Hasil pemisahan diperoleh 137 Cs-zeolit dalam fasa padat dan isotop lainnya berada dalam fasa cair. Padatan 137 Cs-zeolit kering kemudian kemudian ditimbang dan diukur aktivitasnya menggunakan spektrometer-. Hasil analisis dengan spektrometer- diperoleh aktivitas padatan 137 Cs-zeolit sebesar 20 mCi. Untuk menjadi sumber radiasi gamma 137 Cs, padatan 137 Cs-zeolit dengan aktivitas 20 mCi dikemas dengan cara memasukkan ke dalam inner-outer capsule terbuat dari stainless steel yang telah dirancang sebelumnya. Container stainless steel diproses menjadi sumber radiasi gamma tertutup (shield source) untuk selanjutnya disertifikasi oleh PTKMR-BATAN sebagai lembaga kalibtrator bahan radioaktif di BATAN. Kata kunci: Larutan proses PEB U3Si2-Al, radioaktif gamma, isotop 137 Cs, penukar kation, zeolit Lampung dan container. ABSTRACT MANUCFACTURING OF 137 Cs GAMMA RAY SOURCE WITH ACTIVITY 20 mCi FROM PEB U3Si2-Al POST IRRADIATION IN STAINLESS STEEL CONTAINER. In the post-irradiation examination of fuel element plate (PEB) U3Si2-Al), a solution of high activity as a result of testing nuclear fuel stored in hotcell with enough volume. The solution can not be discarded as waste because it still contains fission isotop such as 137 Cs, uranium and transuranium, which has a long...

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“…4 and Table 2). The 134 Cs/ 137 Cs ratio released from the FNPP1 is known to be approximately 1 (Komori et al, 2013;Kobayashi et al, 2015Kobayashi et al, , 2017. The 134 Cs/ 137 Cs ratios in the upper 9 cm depth of core 4W-2012 range from 0.85 to 1.12 (average; 0.95) ( Fig.…”

mentioning

confidence: 99%

Impact of the 2011 off the Pacific coast of Tohoku earthquake on a deep-sea benthic ecosystem: evidence from living and dead benthic foraminifera on the landward slope of the Japan Trench

Tsujimoto

Nomura

Nomaki

et al. 2018

Preprint

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Abstract. We examined the impact of the earthquake and tsunami following the 2011 off the Pacific coast of Tohoku earthquake on the deep-sea benthic ecosystems based on radionuclide and benthic foraminiferal analysis of core sediments, collected from 3200 and 3600m water depths 5 and 17 months after the earthquake. Radionuclide analysis of the excess 210Pb, 134Cs, and 137Cs indicated that some of the analyzed sediment core recorded deposits before the earthquake, event deposits just after the earthquake, and deposits after the Fukushima Daiichi Nuclear Power Plant accident, which caused the release of a large amount of radioactive material 4 days after the earthquake. Uvigerina senticosa, Chilostomella oolina, and Elphidium batialis were the dominant species in the study area prior to the earthquake. In core 4W-2012, the original or pre-earthquake assemblage layer was covered by 5-cm-thick event deposits following the earthquake that contained a high diversity allochthonous foraminiferal assemblage. Following the episodic deposition, foraminiferal density drastically decreased and many species disappeared, resulting in a decrease in species diversity. Above 10cm depth in the sediment, living specimens of opportunistic and competitive species gradually increased toward the sediment surface and became dominant in the top 1cm of the core. Thus, the episodic deposition resulting from the earthquake caused a drastic decrease in the original benthic foraminifera and colonization of opportunistic species with a low diversity within 17 months. Although there were differences in vertical change in the radionuclides and benthic foraminifera between sites, faunal change may have already occurred 5 months after the earthquake.

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Radioactive contamination mapping of northeastern and eastern Japan by a car-borne survey system, Radi-Probe

Cited by 27 publications

References 14 publications

Development of a Portable Gamma-ray Survey System for the Measurement of Air Dose Rates

Development of a Portable Gamma-ray Survey System for the Measurement of Air Dose Rates

PEMBUATAN SUMBER RADIASI GAMMA 137Cs DENGAN AKTIVITAS 20 mCi DARI PEB U3Si2-Al PASCA IRADIASI DALAM CONTAINER STAINLESS STEEL

Impact of the 2011 off the Pacific coast of Tohoku earthquake on a deep-sea benthic ecosystem: evidence from living and dead benthic foraminifera on the landward slope of the Japan Trench

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