Shutters and Interlocks TS1 (R55)

The Shutter is a large wedge of steel between the target and the instrument which stops the neutrons. Each instrument has its own shutter and this can be raised or lowered from controls found beside the instrument and inside the cabin. To prohibit access to areas of high radiation, a series of interlocks have to be completed before it is possible to open the shutter.

The correct use of the interlocks system helps to ensure that: 

1.   Nobody is left inside high radiation areas.

2.   That all the sections of removable shielding have been replaced.

3.   That all the doors are closed and locked.

The interlock systems on each instrument are configured according to the instrument layout; your local contact will help you understand the layout on the instrument you are using.

Instruments, which have their sample positions inside a blockhouse, will also have a search button. This button must be pressed by the last person to leave the blockhouse.

Instrument Search Button

Instrument Search Button
View full-size image

You may then close and lock the door.

All interlock systems have the following features.

First, there are locks on various parts of the instrument. The photograph above shows the door lock on CRISP.

CRISP Door Lock

CRISP Door Lock
View full-size image

Second, there are one or more green boxes containing racks of keys. When all the door keys are placed in these racks the master key will be released.

Third, there is a green master box – with a key labelled with an M. This is the box that controls the shutter – with the key in place the shutter is released and can be opened.

Green Master Box

Green Master Box
View full-size image

As the shutter opens a blue light comes on inside the high radiation area. This is linked to the shutter controls and to a radiation monitor. If you are working in a controlled area and the blue light comes on press the red beam off button or just leave the area as quickly as possible. Telephone the MCR and your local contact straight away.

Beam off buttons are found all over the hall your Local Contact will point out the locations around your instrument.  They are linked to the accelerator and can be used to trip the beam off in cases of emergency. 

In summary. Make sure that you know:

1)      Where the interlocks are and how they are operated.

2)      Where the search button is, if it exists.

3)      Where the nearest red beam off buttons are.

Previous     Next

Bookmark and Share
Skip to the top of the page