radiation worker education - osaka university2014 re-education for rcnp radiation workers research...
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2014 Re-education for RCNP Radiation Workers
Research Center for Nuclear Physiscs, Osaka University Radiation safety supervisor SUZUKI Tomokazu
Radiation Worker education
Radiation workers need to receive education and training established by laws.
first entering radiation control area
at least once every year there after
Required items
Effect of radiation on the body (before entering: 30 min.)
Safe handling of radio-isotopes and radiation generators (before entering: 4 hrs.)
Laws and ordinances on prevention of radiation hazard by radioisotopes and radiation generators (before entering: 1 hrs.)
Local radiation protection rules (before entering: 30 min.)
Medical Examinations
All of radiation workers should be have a medical examinations. once in year (guest researchers) twice in year (workers in Japan; in addition, controlled by the labor standard Act)
If you are not Japanese, if you are belonging foreign facilities, you need to have medical examinations because RCNP is controlled by Japanese laws. Examination items
oral interviews (including history of your radiation exposure) Amount of hemoglobin, counts of red and white blood cells and percentage of white blood cells in the peripheral blood Skin Eyes
Radiation exposure Measurement
External exposure measurement
Quixel badge (Nagase-LANDAUER)
MYDOSE mini (Pocket dose meter, Hitachi-ALOKA)
Internal exposure measurement
Very difficult
Internal exposure is assumed by calculation from used-amount of un-sealed radio isotopes.
Dose Limit for radiation workers
Effective dose Limit
100 mSv/5years
50 mSv/year
5 mSv/3months for women (excluding those diagnosed an infertile or pregnant)
1 mSv for pregnant women (period from confirmation of pregnancy to delivery)
equivalent dose limit
Lens of eye 150 mSv/year
Skin 500 mSv/year
abdomens of pregnant women 2mSv
Summary of the matters working in radiation control area
Radiation Safety Education
Total 6 hours before first entering the control area
All subjects for at least once every year there after Medical Examination items
oral interviews (including history of your radiation exposure) Amount of hemoglobin, counts of red and white blood cells and percentage of white blood cells in the peripheral blood Skin Eyes
Radiation exposure measurement
Japanese culture about radiation
The history about radiation in Japan
1945 Atomic bombings of Hiroshima and Nagasaki
1954 Daigo Fukuryumaru (tuna fishing boat) was exposed to and contaminated by nuclear fallout
1963 start a nuclear electricity generation
1986 The Cherbobyl accident
1999 JCO criticality accident
2011 Fukushima Daiichi nuclear disaster accident
2013 J-PARC accident Japanese people are educated many “nuclear accident”, but not educated about radiation.
Many Japanese are afraid about radiation. Many Japanese hospitals have medical radiation device ex. X-ray, CT, PET….
In Japan, nuclear researchers must take care for people’s emotion.
What’s do we study from J-PARC accident?
An accelerator is not safety by the power-off with high intensity beam.
The target was evaporated.
The experimental hall was contaminated by evaporated radio-isotopes.
IN RCNP….
Probably, targets are not evaporated, because beam power is very lower than J-PARC (400 MeV, 1.1 uA).
However, we must consider that targets melt with heat.
The melted targets are activated.
The floor and …. are contaminated.
Take care to use your targets!
Activated Material control
From JFY2011, activated materials (devices) are controlled under laws.
under the Japanese law, activated material is kind of contaminated material.
A standard of activated or not, is referred to clearance levels, not isotopes lower limit.
clearance level for activated materials
第一欄 第二欄 第三欄濃度確認対象物 評価対象放射性同位元素の種類 放射能濃度(Bq/g)
二 放射線発生装置から発生した放射線により生じた放射線を放出する同位元素によって汚染された物であって金属くず又はコンクリート破片
22 0.154 0.156 0.157 158 160 1152 0.1195 10203 10
RI濃度限度(Bq/g)
101010100101010100100
(n,r)…
(n,2n), (p,a)…
(p,n), (p,2n)…
Activated by cyclotron
壁
target
beam(charged particle)
Chambers
Other devices which has always put
low energy neutron
high energy neutron
fluorescent lamp used in Osaka university
cool white lamp・・・Europium is doped for phosphors
measured the dose rate by NaI(Tl) survey meter The activated lamp was clashed and packed in U8 cup. Non-activated lamp was clashed and packed with 1 kBq, 5cc EuCl3 in U8 cup ( for the calibration source). measured the activity by germanium detector.
activation for fluorescent lamp in RCNP
A lamp used in cyclotron hall was activated to 0.01-0.03 uSv/h (measured by NaI(Tl) survey meter).
The activity for one lamp was 0.7 - 1.3 kBq.
The density was ~5 Bq/g. This value is 50 times larger than clearance level for Eu-152.
Activated devices
Activated materials can be transferred to Japanese Accelerator facility only.
Don’t export activated devices.
Maybe, used target is brought to foreign facility due to activate.
How to do experiment in RCNP
For all persons entring radiation control area submit your ”Radiation Worker Registration Form" to radiation control office. Radiation safety education (this education) medical examination
For Experiment’s spokesperson submit “radiation condition form” before experiment to radiation control office (if not submitted, beam is not provided to your beam course.) submit “Accelerator use termination report” after experiment to radiation control office.
In the experiment period
measure your dose by glass badge or quixel badge.
measure your dose by mydose mini.
This values should be reported in “Accelerator use termination report”.
Temporary card is not for radiation worker. Don’t do experiment with temporary card (Lab. tour only).
procedure for entering radiation control area
register your fingerprint or felica IC card at radiation control officefelica: Japanese standard IC card
supermarket’s point card trains ticket (Suica, ICCOCA, PiTaPa etc.) ANA or JAL’s milage card ID card for RIKEN, SPring-8
Card reader
fingerprint
LED status(blue/light blue ) or (blue/yellow) permitted
red/black Not permitted
for the primary control area change your shoes at entrance of primary’s
If you use un-sealed RI, put on the RI coat
procedure for entering experimental hall
Safety key
1. announcement 2. touch your card or fingerprint 3. remove a safety key 4. open the door 5. turn on a safety switch
safety switch
how to get beam
1. Turn off all safety switches. 2. All persons go out from experimental hall.
3. Return your safety keys. 4. Push green button (退避確認).
5. Push white and red button at the same time.
開 -> Open
閉 -> Close
Local Radiation Protection Rules
Radiation protection law is written about lowest safety.
Local protection rule and radiation protection law are same category. If local rule is not obeyed, it is violation of the law.
difference of laws and local rules
(Law) Don’t be eating and smoking in the radiation working room.
(Local rule) Don’t be eating, drinking, smoking and making in the radiation control area.
火災!事故など!
Fire, Accident etc. !!
ケガ!病気など!
Injury, Illness etc. !! 保健センター Health Administration
Center 内線 Ext. 8970 友紘会総合病院 YUKOUKAI General Hospital
内線 Ext. 0-‐072-‐641-‐2488
消防署/救急車 Fire Station/Ambulance
内線Ext. 119 (内内線Inner Ext. 0-‐119)
携帯Mobile 119!【センター長】 Director 中野 Nakano 内線 Ext. 8900, 8924
【防火管理者 】!Fire Prevention Supervisor 野海 Noumi 内線 Ext. 8933
【事務長】! Office Manager 内線 Ext. 8901
【庶務係長】 Chief 内線 Ext.8902, 8903
緊急時の連絡体制 Emergency Contact Details
心肺蘇生法と!AEDを使用した救命
(AEDはAVF棟玄関に設置)
オペレーター Operator OGFA,SAS 8888
発見者 Witness
【放射線取扱主任者】
Radiation Protection Supervisor
鈴木 Suzuki 内線 Ext. 8832, 8830 【運転責任者】!
Accelerator Operation Supervisor
Main: 090-‐3051-‐3770 Sub: ###-‐####-‐####
Easy Japanese for Emergency
Fire ・・・ 火事です! (kaji desu!)
an injury ・・・けがです! (kega desu!)
an illness ・・・ 病気です!(Byoki desu!)
an accident ・・・事故です! (jiko desu!)
Attention in radiation control area
Have a dose mater.
Don’t be eating, smoking and making.
When you take RI in your body, call to radiation safety supervisor.
When you leave the control area, you need to check contamination. If you are contaminated, you must remove RI from your body clothes etc…
When you take out something from control area, you need to check contamination and activation.
Our Survey-meters
For γ-rays(for activated materials) For β-rays(for contaminated materials)
GM survey-meterNaI(Tl) survey-meter
Ionization-chamber type#survey-meter
Compact Survey-meter
Scintillation survey-meter
プラスチック
ラギッド