NRL Irradiation Facility Neutron Fluxes and Neutron & Gamma Dose Rates
| Facility | Total Neutron Flux (n cm-2 s-1) | Percent Thermal (%) | Thermal Neutron Flux (n cm-2 s-1) | epi-Cd Neutron Flux (n cm-2 s-1) | 1.0 MeV Equivalent Neutron Flux (n cm-2 s-1) | Neutron Dose Rate in Si (rad-Si/hr) | Gamma Dose Rate in Si (rad-Si/hr) |
|---|---|---|---|---|---|---|---|
| 1.3" CIF | 2.7E13* | 60 | 1.6E13* | 1.1E13* | 5.6E12 (Si)^, 6.0E12 (GaAs)^ | 1.6E06# | 8.7E07§ |
| 2.4" AIF | 1.1E13** | 54 | 6.0E12** | 5.2E12** | 2.3E12 (Si)^, 2.5E12 (GaAs)^ | 6.9E05# | 3.8E07§ |
| Pneumatic Transport System (PTS) / Rabbit | 3.4E12^^ | 69 | 2.3E12^^ | 1.1E12^^ | 5.5E11 (Si)^, 6.0E11 (GaAs)^ | 1.6E05# | not measured |
| 6.5" External Dry Tube | 1.9E12## | 75 | 1.4E12## | 4.9E11## | 2.7E11 (Si)^, 3.0E11 (GaAs)^ | 8.5E04# | 7.6E06§ |
| 9.5" External Dry Tube (Flux Box Evacuated) |
1.1E12§§ | 74 | 8.0E11§§ | 2.9E11§§ | 1.6E11 (Si)^, 1.8E11 (GaAs)^ | 4.8E04# | 4.4E06§ |
| Thermal Column G7, core end, stringer open |
not measured | not measured | 2.7E11*** | not measured | not calculated | not calculated | not measured |
| Thermal External Beam Line Facility (TBF) | not measured | not measured | 3.4E06^^^ | not measured | not calculated | not calculated | not measured |
| Fast External Beam Line Facility (FBF) – No Thermal Filter – Gamma Shutter Open | 2.3E07### | 36 | 0.8E07### | 1.5E07### | not calculated | not calculated | not measured |
| Fast External Beam Line Facility (FBF) – No Thermal Filter - Gamma Shutter Closed | 2.9E05§§§ | 9 | 0.3E05§§§ | 2.6E05§§§ | not calculated | not calculated | not measured |
Note: All values are listed at a reactor power of 450 kW
| Facility | Inner Dimension |
|---|---|
| Central Irradiation Facility (CIF) | 1.3" diameter |
| Auxiliary Irradiation Facility (AIF) | 2.4" diameter |
| Pneumatic Transport System (PTS) / Rabbit | 1.1" diameter = mouth of the polyethylene sample bottles used in the PTS |
| 6.5" Movable Dry Tube | 6.6" diameter |
| 9.5" Movable Dry Tube | 9.5" diameter |
| Thermal Column | 4" x 4" Square / Stringer |
| Thermal External Beam Line Facility (TBF) | ~30 mm diameter |
| Fast External Beam Line Facility (FBF) | ~30 mm diameter |
* NRL memo 2020-15 Rev 01, "CIF Neutron Spectrum Measurement"
^ NRL memo 2013-12 Rev 07, "1.0-MeV-Equivalent Flux Calculations in Si and GaAs"
# NRL memo 2021-04, "Facility Characterization - Neutron Dose Rate in Silicon"
§ NRL memo 2016-17 Rev 03, "Gamma Dose Rates of Reactor Facilities"
** NRL memo 2020-16 Rev 01, "AIF Neutron Spectrum Measurement"
^^ NRL memo 2020-18 Rev 01, "Rabbit Neutron Spectrum Measurement"
## NRL memo 2020-19 Rev 01, "6.5-inch External Dry Tube Neutron Spectrum Measurement"
§§ NRL memo 2020-22, "9.5-inch External Dry Tube (Flux Box Evacuated) Neutron Spectrum Measurement"
*** NRL memo 2021-14, "Thermal Flux Measurements within Thermal Column Sample Holder"
^^^ NRL memo 2020-20, "Thermal Beam Facility Flux Measurements"
### NRL memo 2021-12 Rev. 02, "Fast Beam Facility (No Thermal Filter) Neutron Spectrum Measurement"
§§§ NRL memo 2022-14, "Fast Beam Facility Shutter Closed (No Thermal Filter) Neutron Spectrum Measurement"
