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