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Safety

H157655_1_008 13

German Regulations

In Germany, regulation BGV B11 describes the maximum exposure doses in two basic

tables. Table 2.1 applies to situations under the standard precautionary conditions, whereas

Table 2.2 applies to systems with field strengths above 5 Tesla and can only be applied to

certain subgroups of people, which meet nonstandard precautionary conditions. Details on

the different precautionary conditions and subgroups of people are given in the document

BGV B11 document.

Exposure Maximum Magnetic Flux Density

Average over 8 hours 212 mT

Peak values for head and body 2T

Peak values for extremities 5T

Standards on health and safety in the workplace for standard precautions

and users, according to BGV B11.

Table2.1: BGV B11 Standards for Standard Precautions and Users

Exposure Maximum Magnetic Flux Density

Average over 8 hours 4T

Peak values for head and body 2T

Peak values for extremities 10T

Health and safety standard in the workplace applicable under special

conditions to selected subgroups of people, according to BGV B11.

Table2.2: BGV B11 Standards Under Special Conditions for Selected Subgroups

The next table shows the maximum retention periods within different stray field regions below

5 Tesla for standard precautionary situations. The corresponding spatial regions within and

around the super-conducting magnet can be worked out from the stray-field plots of the

magnet being used.

Magnetic Flux Retention Period Parts of the Body

5T < 20 Minutes Extremities

4T < 25 Minutes Extremities

3T < 34 Minutes Extremities

2T < 52 Minutes Head/Body

1T < 1 Hour 42 Minutes Head/Body

0.5T < 3 Hours 23 Minutes Head/Body

0.3T < 5 Hours 39 Minutes Head/Body

We do not take any responsibility for the numbers given in this table!

Table2.3: Example of Maximum Retention Periods

If higher field strength is accessible inside the magnet by a user’s extremities, a

corresponding table for non-standard situations can be worked out from the table above.

However, the analysis must be carried out in a more detailed and differentiated manner and a

greater number of more important conditions must be strictly fulfilled.

Bruker AVANCE User Manual

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