Anomalously High Radon Concentrations in a Dwelling in Okinawa, Japan

Kranrod, Chutima; Tokonami, Shinji; Ishikawa, Tetsuo; Hosoda, Masahiro; Janik, Mirosław; Shingaki, Reina; Furukawa, Mutsuhisa

doi:10.3769/radioisotopes.58.807

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…3 B. The data exhibit the general pattern reported in numerous studies [ 20 – 22 ]. The maximum and minimum values of each measurement month were observed in the morning (around 9:00 JST) and in the afternoon (around 15:00 JST), respectively.…”

Section: Resultssupporting

confidence: 79%

A comparison of the dose from natural radionuclides and artificial radionuclides after the Fukushima nuclear accident

Hosoda¹,

Tokonami²,

Omori³

et al. 2016

Journal of Radiation Research

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Due to the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, the evacuees from Namie Town still cannot reside in the town, and some continue to live in temporary housing units. In this study, the radon activity concentrations were measured at temporary housing facilities, apartments and detached houses in Fukushima Prefecture in order to estimate the annual internal exposure dose of residents. A passive radon–thoron monitor (using a CR-39) and a pulse-type ionization chamber were used to evaluate the radon activity concentration. The average radon activity concentrations at temporary housing units, including a medical clinic, apartments and detached houses, were 5, 7 and 9 Bq m−3, respectively. Assuming the residents lived in these facilities for one year, the average annual effective doses due to indoor radon in each housing type were evaluated as 0.18, 0.22 and 0.29 mSv, respectively. The average effective doses to all residents in Fukushima Prefecture due to natural and artificial sources were estimated using the results of the indoor radon measurements and published data. The average effective dose due to natural sources for the evacuees from Namie Town was estimated to be 1.9 mSv. In comparison, for the first year after the FDNPP accident, the average effective dose for the evacuees due to artificial sources from the accident was 5.0 mSv. Although residents' internal and external exposures due to natural radionuclides cannot be avoided, it might be possible to lower external exposure due to the artificial radionuclides by changing some behaviors of residents.

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Section: Resultssupporting

confidence: 79%

A comparison of the dose from natural radionuclides and artificial radionuclides after the Fukushima nuclear accident

Hosoda¹,

Tokonami²,

Omori³

et al. 2016

Journal of Radiation Research

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“…Moreover, three weeks of measurements in Okinawa using the active method also showed elevated radon concentrations exceeding 1000 Bq m −3 , with an average concentration of about 400 Bq m −3 [100]. The same high temporal variability, with occasional very high concentrations >1000 Bq m −3 , was also observed during the long-term measurements of radon in the basement room of the institute building [101].…”

Section: Japan (Ii)supporting

confidence: 53%

Indoor Radon Research in the Asia-Pacific Region

Janik¹,

Bossew

Hasan

et al. 2023

Atmosphere

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Indoor radon is a major hazard to human health; it is one of the leading causes of lung cancer. Therefore, radon research in Asia has intensified recently due to the growing awareness of the harm that radon poses. An analysis of the collected literature data showed that in Asia–Oceania, some regions have—or are believed to have—little indoor radon problems due to climate and low Rn ground. It can be concluded that countries have their own approaches, techniques, and protocols. Data were not harmonized within each region; however, measurement techniques were compared by regional intercomparison exercises. The situation differs regarding studies on the usability of radon as a tracer or potential predictor of tectonic phenomena, as some countries are in seismically active zones, such as India, Taiwan, China, Japan, etc. India and Taiwan are global leaders in this research, as well as Italy, which is another seismically affected country. We provide an overview of radon-related surveying and research activities conducted in the western, southern, and eastern Asian regions over the past few years. Additionally, we observed that the number of indoor radon measurements per million inhabitants increases as the human development index (HDI) increases.

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Characteristics of indoor radon and its progeny in a Japanese dwelling while using air appliances

Pornnumpa

Tokonami

Kranrod

2015

Radiation Protection Dosimetry

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Characteristics of radon and its progeny were investigated in different air conditions by turning four types of indoor air appliances on and off in a two-story concrete Japanese dwelling. The four appliances were air conditioner, air cleaner, gas heater and cooker hood. The measurements were done using two devices: (1) a Si-based semiconductor detector for continuous measurement of indoor radon concentration and (2) a ZnS(Ag) scintillation counting system for equilibrium-equivalent radon concentration. Throughout the entire experiment, the cooker hood was the most effective in decreasing indoor radon concentration over a long period of time and the less effective was the air conditioner, while the air cleaner and gas heater did not affect the concentration of radon. However, the results measured in each air condition will differ according to the lifestyles and activities of the inhabitants. In this study, indoor radon and its progeny in a Japanese dwelling will be characterised by the different air conditions.

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Anomalously High Radon Concentrations in a Dwelling in Okinawa, Japan

Cited by 8 publications

References 16 publications

A comparison of the dose from natural radionuclides and artificial radionuclides after the Fukushima nuclear accident

A comparison of the dose from natural radionuclides and artificial radionuclides after the Fukushima nuclear accident

Indoor Radon Research in the Asia-Pacific Region

Characteristics of indoor radon and its progeny in a Japanese dwelling while using air appliances

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