Investor Presentaiton
Assessment of Radiological Impact on public and environment ②
Effects on the public and the environment were minimal~
Results of the assessment on the public found that the exposure dose was approx. 1/70,000 to approx. 1/5,000 of
natural radiation exposure (average in Japan : 2.1 mSv/year).
Results of the assessment on animals and plants (flatfish, brown seaweed) found that the exposure dose was
approx. 1/50,000 to approx. 1/20,000 of the derived consideration reference level (DCRL) defined by the ICRP.
(In the case of crab, approx. 1/500,000 to approx. 1/200,000)
Human
3
Animals and
plants
Stomach X-ray
approx. 3 mSv
Results of this
assessment
0.00003
~0.0004
mSv*/year
0.1
0.05
0.0001
2.1
Natural radiation
exposure
(average in Japan /
per person)
2.1 mSv/year
(Breakdown)
From space Approx. 0.3
From the ground Approx. 0.33
Inhaled radon etc. Approx. 0.48
Ingested from food Approx. 0.99
Dose limit for the general public
1 mSv/year
Flying between Tokyo and New York
(round trip)
approx. 0.11 0.16 mSv
Dose constraint for the discharge of ALPS treated
water
approx. 0.05 mSv/year
X ray exam at the dentist
approx. 0.01 mSv
Results of this
assessment
0.00002
~0.00006
mGy* /day
DCRL defined by the
ICRP
1~10 mGy per day*
(10 times this amount
for crab)
* Sievert (Sv) is a unit
expressing the impact of
radiation on the human
body.
* Gray (Gy) is a unit
expressing the energy of
radiation on matter
Reference :
Radiological Impact
Assessment Report
Regarding the
Discharge of ALPS
Treated Water into the
Sea (design stage)
Source: National Institute of Radiological Sciences
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