1. Control Racks Behind Nth Shield Wall modelled with
Preliminary Results of Magnetic Field Analysis for Specific Items in Step IV
Control Racks Behind Nth Shield Wall modelled with
Aluminium or Steel frame
Mike Courthold 2nd October 2012

2. Steel racks behind Nth Wall – Field strength on far side of Nth Wall is 0.4T, thus 621G max on rack sides

3. Steel racks behind Nth Wall – Field strength on far side of Nth Wall is 0.4T, hence effect on rack sides

4. Steel racks behind Nth Wall – 18G max inside

5. Steel racks behind Nth Wall – 18G max inside

6. Steel racks behind Nth Wall – 18G max inside

7. Aluminium racks behind Nth Wall – Field strength on far side of Nth Wall still 0.4T, but only 5G max on rack sides

8. Aluminium racks behind Nth Wall – Field strength on far side of Nth Wall is still 0.4T, but now negligible effect on frame

9. Aluminium racks behind Nth Wall Field now increased from 18G to 38G max inside

10. Aluminium racks behind Nth Wall Field now increased from 18G to 38G max inside

11. Conclusion
Changing rack frames from steel to aluminium dramatically reduces the field experienced by the rack frame from 621G to 5G
But the field experienced by ferrous objects inside the rack has increased, according to this crude model, from 18G to 38G
The model is as yet to crude to indicate whether the choice of aluminium framed racks would be beneficial, as no attempt has been made to accurately distribute the mass within