Superconducting Magnet Division

Date	Building	Source/Job	Area Sampled	Exp. Level (dBa)
5/7/2003	943	Control Room (Horizontal Test Console)	Operator Position 6-hour dosimetry	65 - 70 (67 back of console) 73.0 max
11/21/02	Dunn & Bush Compressor	Helium Compressors (Cryo)	Inside Area Survey	94.2 – 100.8
11/21/02	Dunn & Bush Compressor	Helium Compressors (Cryo)	Outside Area Survey (Doors Closed)	76.5 – 92.0 (92 @ louvers by double door)
7/9/02	Outside of 902 (NW corner)	High-bay Once-Through Water Air Conditioning Unit (between LN2 Dewar and Building 944)	Area Survey around Heat Exchanger and Pumps	82 – 86 (92 max by pump)
12/5/2001	902	Short Sample Test Facility (SSTF) Power Supplies	Area Survey of Room 022A	90.7 – 94.0
3/24/1999	948	Compressor	Area Survey	84.7-90.2
8/5/1998	902	Refrigeration Building	Area Survey	98.1-98.8
8/5/1998	902	Pump Room	Area Survey	86.3-95.1
8/5/1998	902	Lower mechanical equipment	Area Survey	79.6-87.7
9/19/1995	835	Compressor Trailer	Employee Occupied Areas	74 - 95
4/27/1995	902	Cooper Tool Hydraulic Cutter	Employee distance	108.4
12/13/1993	902	HVAC system background	High-bay (NW corner)	88 max
3/18/1993	924	Compressor & pump room	At doorway into room	88
6/16/1992	944	Pumps	In pump room	90+
1/29/1992	902	MAG cool quench	Maximum during quench	97.9
9/9/1991	902	Vapor blaster	Operator Location	89.1
6/7/1991	905	Collaring press	High-bay (at operator level)	87 max
8/17/1989	924	Vacuum equipment	High bay area	104 max
7/18/1989	902/3A	Compressors (A/C)	Basement	88.2 max
1/17/1989	924	Pumps (oil)	Pump room	90 max
6/26/1987	902	Compressors	Dosimeter worn at ear level	88.2 –102
1/6/1983	905A	Num. C. Milling Machine- Drilling Holes in Steel	Operator Location	88-95.4
6/11/1981	902	Liquid Helium Cryogen Facility- Compressors	Area Survey in Compressor Room	92 - 99

Notes:

Requirements can be found in the SBMS subject area Noise and Hearing Conservation

· Maximum 8-hour (time weighted average) noise exposure is 85 dBA

· Maximum impact or impulse noise exposure is 140 dB peak.

Even exposure below these values should be avoided if possible by the use of

· Personnel Protective Equipment (PPE),

· Sound absorbing material,

· Minimizing time of exposure and

· Maximizing the distance from the source.

Contact your ESH Coordinator for additional information.

Rev May 03