HomeMy WebLinkAboutlegacy chiro for forge architect shielding 4-19\PHYSICAL FACTORS and SHIELDING REQUIREMENTS
ESTIMATED
WORKLOAD
50 mA min/week For
Legacy – Chiropractic
DATE April 1, 2019
Max kVp
125 kV
7241 E. 146th Street
Carmel, IN 46033
Submitted By: Sarah Hughes, MS, DABR
Medical Physicist
Max mA
300 mA
BARRIER DESCRIPTION
OCCUPANCY
TYPE
(C or N-C)
BARRIER
TYPE
(P or S)
U
T
UT
OCCUPANCY
DISTANCE
(feet)
TOTAL
SHIELDING
REQUIRED
EXISTING
SHIELDING
ADDITIONAL
SHIELDING
REQUIRED
SOUTH Wall with Vertical Chest Holder
toward other tenant space
N-C P 1 1 1 8.5 1/16” Pb None 1/16” Pb
WEST Wall – wall toward Restroom and
Utility Room
N-C S 1 ¼ ¼ 6 4 of 5/8” Gypsum 2 of 5/8” Gypsum 2 of 5/8”
Gypsum
DOOR into room N-C S 1 1/8 1/8 12 1/32” Pb None 1/32” Pb
NORTH Wall – toward Physical Therapy
Area
N-C S 1 ½ ½ 1 4 of 5/8” Gypsum 2 of 5/8” Gypsum 2 of 5/8”
Gypsum
EAST Wall – to Consultation room N-C S 1 ½ ½ 4 1/32” Pb None 1/32” Pb
NOTHING ABOVE OR BELOW
NOTE: THERE SHALL BE A PERMANENT OPERATOR BARRIER WALL IN PLACE WITH VIEWING WINDOW AND AT LEAST 1/32” Pb EQUIVALENT
SHIELDING
DATE: April 1, 2019
FROM: Sarah Hughes, MS – 502-552-5454
Daves and Kelly, Inc.
TO: Forge Architecture
CC: Office tenant
SUBJECT: Shielding specification for X-ray Room
The enclosed tabular information specifies the minimum shielding requirements for the stated room. All
computations were based upon the information supplied by Forge Architecture. They are shown on the attached
specification. The following pertinent information is also noted:
1. For calculational purposes, maximum permissible exposure values were taken as 10 mR/week for controlled (C)
personnel and 2 mR/week for non-controlled (N-C) personnel.
2. Where there is removal of any part or section of the radiation barriers for construction purposes (e.g., junction
boxes, ducts, lock mechanisms in doors, conducts, etc.) the removal shall be compensated for by replacement with
adequate attenuating material.
3. Doors shall have the same beam attenuation property as the walls in which they are located. It should be emphasized
that door frames and thresholds shall not allow scattered radiation paths, resulting in radiation levels in excess
of the above stated maximum permissible exposure values. Similarly, viewing windows shall have the same beam attenuation as the structures in which they are located.
4. Lead thickness is given as calculated. Such thickness is not always commercially available. If available thickness
is not more than 5% less than those specified, it may be used. Otherwise, the next thicker available thickness shall
be used.
5. Where concrete is used as a radiation barrier, its dry density shall not be less than 147 lbs./cu. ft..
6. These specifications shall not be deemed to limit the maximum thickness or height of lead or concrete. Primary (P)
barriers shall be at least seven feet high.
ADDITIONAL NOTES: A COPY OF THE SHIELDING PLAN MUST BE KEPT ON FILE AT THE FACILITY FOR REVIEW BY INSPECTORS.