16 Del. Admin. Code § app A § 4465-X-A-4.0

Current through Register Vol. 28, No. 7, January 1, 2025

Section 4465-X-A-4.0 - Neutron Shielding

4.1 In addition to the requirements listed in Section III above, therapeutic radiation machine facilities that are capable of operating above 10 MV shall submit shielding plans which contain, as a minimum, the following additional information:

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

4.1.2 Description of all assumptions that were used in neutron shielding calculations including, but not limited to, neutron spectra as a function of energy, neutron fluence rate, absorbed dose and dose equivalent (due to neutrons) in both restricted and unrestricted areas;

4.1.3 At least one example calculation which shows the methodology used to determine the amount of neutron shielding required for each physical condition [i.e.: restricted and unrestricted areas, entry door(s) and maze] and neutron shielding material utilized in the facility:

4.1.3.1 If commercial software is used to generate shielding requirements, also identify the software used and the version/ revision date; and

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

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

16 Del. Admin. Code § app A § 4465-X-A-4.0

16 DE Reg. 1274 (6/1/2013)
22 DE Reg. 401 (11/1/2018) (Final)