New Hampshire Code of Administrative Rules
He - Department of Health and Human Services
Subtitle He-P - Former Division of Public Health Services
Chapter He-P 4000 - NEW HAMPSHIRE RULES FOR THE CONTROL OF RADIATION
Part He-P 4047 - USE OF RADIATION MACHINES: THERAPEUTIC RADIATION MACHINES
Section He-P 4047.09 - Shielding and Safety Design Requirements

Universal Citation: NH Admin Rules He-P 4047.09

Current through Register No. 40, October 3, 2024

(a) Each therapeutic radiation machine subject to He-P 4047.06 or He-P 4047.07 shall be provided with such primary and secondary barriers as are necessary to ensure compliance with He-P 4020.05 and He-P 4020.13.

(b) Facility design information for all new installations of a therapeutic radiation machine or installations of a therapeutic radiation machine of higher energy into a room not previously approved for that energy shall be submitted for DHHS/RHS approval prior to actual installation of the therapeutic radiation machine.

(c) The following minimum facility design information shall be submitted to DHHS/RHS with any request for the therapeutic radiation machine installation approval:

(1) For any therapeutic radiation machine, the following basic facility information:

a. Name;

b. Telephone number;

c. The DHHS/RHS registration number of the individual responsible for preparation of the shielding plan;

d. Name and telephone number of the facility supervisor;

e. The facility street address;

f. The facility room number for the therapeutic radiation machine;

g. Indication if this is a new structure or a modification to existing structure(s);

h. The primary barriers for all wall, floor, and ceiling areas struck by the useful beam;

i. All secondary barriers provided in all wall, floor, and ceiling areas not having primary barriers;

j. If commercial software is used to generate shielding requirements, the software name, version, and date of revision;

k. If the software used to generate shielding requirements is not in the open literature, quality control sample calculations to verify the result obtained with the software;

l. The structural composition and thickness or lead equivalent of all walls, doors, partitions, floor, and ceiling of the room(s) concerned;

m. The type of occupancy of all adjacent areas inclusive of space above and below the room(s) concerned, and any exterior wall(s), with distance to the closest area(s) where it is likely that individuals may be present; and

n. At least one example calculation which shows the methodology used to determine the amount of shielding required for each primary and secondary/leakage barriers, restricted and unrestricted areas, entry door(s), and shielding material in the facility.

(2) In addition to the requirements listed in He-P 4047.09(c) (1) , therapeutic radiation machine facilities which produce only photons with a maximum energy less than or equal to 150 kV shall submit shielding plans which contain, as a minimum, the following additional information:

a. Equipment specifications, including the manufacturer and model number of the therapeutic radiation machine, as well as the maximum technique factors;

b. Maximum design workload for the facility to include:

1. Total weekly radiation output expressed in gray (rad) or air kerma at 1 meter;

2. Total beam-on time per day or week;

3. The average treatment time per patient; and

4. The anticipated number of patients to be treated per day or week; and

c. A facility blueprint/drawing indicating:

1. Scale;

2. Direction of North;

3. Normal location of the therapeutic radiation machine's radiation port(s);

4. The port's travel and traverse limits;

5. General direction(s) of the useful beam;

6. Locations of any windows and doors;

7. The location of the therapeutic radiation machine control panel;

8. The location of the operator's booth if the control panel is located inside the therapeutic radiation machine treatment room; and

9. The operator's station at the control panel has a protective barrier sufficient to ensure compliance with He-P 4020.05;

(3) In addition to the requirements listed in He-P 4047.09(c) (1) , therapeutic radiation machine facilities that produce photons with a maximum energy in excess of 150 kV or electrons shall submit shielding plans which contain, as a minimum, the following additional information:

a. Equipment specifications to include:

1. The manufacturer;

2. The model number of the therapeutic radiation machine;

3. The gray or rad at the isocenter;

4. The energy(s) and type(s) of radiation produced; and

5. The target to isocenter distance;

b. Maximum design workload for the facility including:

1. Total weekly radiation output expressed in gray rad at 1 meter;

2. Total beam-on time per day or week;

3. The average treatment time per patient; and

4. The anticipated number of patients to be treated per day or week;

c. Facility blueprint or drawing indicating:

1. The floor plan and elevation views each indicating relative orientation of the therapeutic radiation machine;

2. Type(s), thickness, and minimum density of shielding material(s);

3. Direction of North; and

4. The locations and size of all beam penetrations through each ceiling, wall, floor, details of the door(s) and maze shielding barrier; and

d. A description of all assumptions that were in the shielding calculations including, but not limited to:

1. Design energy;

2. Work-load;

3. Presence of integral beam-stop in unit;

4. Occupancy and use(s) of adjacent areas;

5. Fraction of time that useful beam will intercept each permanent barrier for all walls, floor and ceiling; and

6. "Allowed" radiation exposure in both restricted and unrestricted areas.

(4) In addition to the requirements listed in He-P 4047.09(c) (3) , therapeutic radiation machine facilities which are capable of operating above 10 MV shall submit shielding plans which contain, as minimum, the following additional information:

a. The structural composition, thickness, minimum density, and location of all neutron shielding material;

b. Description of all assumptions that were used in neutron shielding calculations including, but not limited to;

1. Neutron spectra as a function of energy;

2. Neutron fluence rate; and

3. Absorbed dose and dose equivalent for neutrons in both restricted and unrestricted areas;

c. At least one example calculation which shows the methodology used to determine the amount of neutron shielding required for each restricted and unrestricted areas, entry door(s), maze and the neutron shielding material utilized in the facility; and

d. The method(s) and instrumentation which will be used to verify the adequacy of all neutron shielding installed in the facility.

#6827, eff 8-6-98; ss by #8692, INTERIM, eff 7-27-06, EXPIRES: 2-2-07; ss by #8808, eff 1-24-07

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