For users
Change of radiation controlled areaclassification at MLF experimental halls
MLF, Oct. 20, 2016

Change of Radiation Controlled Area
Classification at MLF Exp. HallsFrom Nov. 1st, 2016, the radiation controlled area classification at the MLF
exp. halls will be changed (2nd class → 1st class).
At the BL１１ exp. room and the 3rd exp. preparation room, normal 1st classradiation controlled area (class B) is applied.
At the exp. halls and the exp. preparation rooms except the above areas, lowsurface contamination area (class C) is applied.
In the maintenance period (long shutdown period at summer), the classification at
the exp. hall will be temporally changed to 2nd class.

Classification

Abbrevia
tionPlace

DetailWear & shoes

1st class radiation
controlled area

1st class A(Maintenance area)

Area to suppose any surface
contamination for maintenanceSpecified clothes
Specified shoes(yellow)

1st class B

BL11 exp. room
3rd exp. preparation
room

Area to suppose any surface
contamination

Specified clothes
Specified shoes(yellow)

1st class C

Experiment hall
1st and 2nd exp.
preparation room

Area not to permit an action
with any surface contamination

No specified clothes
Specified shoes(white)

Primary radiation
control area
Low surface
contamination area

Modification point (1) Enter to and exit from the MLF experimental halls→ Via the contamination survey room
→ Change to specified shoes (White)→ Contamination survey by a hand-foot-cloth-monitor isnecessary when exit from the MLF exp. halls.
→ Baggage lockers at the locker room is available to checka luggage.
→ Objects can be carrying in and out via old entrance

also.
→ Users can also enter and exit via the contamination
survey room at the BL08, BL09 and BL22 building. When
exiting from these buildings, contamination survey byhand-foot-cloth-monitor is necessary.
※When an emergence, evacuate via an emergency exit nearby.

Modification point (2) Bringing objects from the experimental halls→ Survey is necessary for objects to bring from theexperimental halls.
→ Object contamination monitor is available to survey objects.
→ A large size object and an irradiated sample must be
surveyed by the radiation control staff.
→ At the BL08, BL09 and BL22 building, because there is noobject contamination monitor, all objects to bring must besurveyed by the radiation control staff.
 Management of waste and unnecessary objects→ Unnecessary objects occurred in the experimental halls is
disposed as a radioactive waste.
→ Don’t bring unnecessary objects

1st class radiation controlled area
Low surface contamination area
1st class radiation
controlled area
1st class radiation
controlled area
Low surface
contamination area

1stclass B

1st class C

Area to suppose
any contamination

Specified cloth
Specified shoes (Y)Area not to allow an No specified cloth
action with
Specified shoes (W)any contamination

1st class B
・BL11 exp. room
・3rd exp. preparation room
1st floor

2nd floorToexperimentalhall

Monitoring room
Object carrying entrance

To 1st exp. hall

Shoes box for outside shoes

Shoes box for experimental halls

Entrance Gate（1）Path to enter

Exit Gate（3）Object contamination monitor（1）

Entrance to exp. halls
Path to exit
Helmet storage area

To 2nd exp. hallUse of a locker
Lockers
Baggage can be checked to the locker inlocker room.

User room

Elevator

Stair

Locker room
Locker: Dial typeContamination Survey room

If code number is forgot,
contact to the radiation team.

Photo.（１）Entrance of contamination
survey room
New entrance

Enter via automatic door andPut outside shoes to shoes box

Old entrance

Objects can be carrying in and out.
This door is usually locked.
The key is managed at Monitoring room.

Photo. （２）Contamination survey room
Shoes box for the experimental halls

Path to the experimental halls

Entrance gate

Exit gate and hand-foot-cloth-monitor

Object contamination monitor can be used.

Photo. （３）For maintenance area
Specified shoes
for maintenance areaUsers : Don’t use these equipment(only for maintenance)

Specified helmets
for maintenance area

Specified clothes
for maintenance area

Management of waste Unnecessary objects occurred in the experimental halls is

disposed as a radioactive waste.
 Several cans for the radioactive waste arelocated in the experimental halls.
 Different type of the radioactive waste
Combustible: Carton box (Red) Fire-resistant: Carton box (White) Nonmetal: Pail can (White) Metal: Pail can (Blue black) Nonsteel: Pail can (Green)

Carton boxPail can Please consult the radiation control staff

separately about large size and highly radio-active waste.
→Keep reduction of the radio-active waste※If any trouble, contact to the radiation team.