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.
Summary of Contents for AVANCE
Page 6: ...Contents vi H157655_1_008 ...
Page 24: ...System Components 24 H157655_1_008 ...
Page 32: ...Magnet Access and Rigging 32 H157655_1_008 ...
Page 38: ...Ceiling Height Requirements 38 H157655_1_008 ...
Page 72: ...Utility Requirements 72 H157655_1_008 ...
Page 82: ...Floor Plan 82 H157655_1_008 ...
Page 96: ...CryoProbe and Other Accessories 96 H157655_1_008 ...
Page 102: ...Contact 102 H157655_1_008 ...
Page 104: ...List of Figures 104 H157655_1_008 ...
Page 109: ...H157655_1_008 109 ...
Page 110: ...Bruker Corporation info bruker com www bruker com Order No H157655 ...