SLOWPOKE-2 Gamma Dose Experiment
36th Annual CNS-CNA Student Conference - 2012 June 12


Presented at:
36th Annual CNS-CNA Student Conference
2012 June 12
Location:
Saskatoon, Canada
Session Title:
CNS/CNA Student Conference 2012

Authors:
Emilia Pruszkowski (Atomic Energy of Canada Limited )
Colin Bruulsema (Atomic Energy of Canada Limited )
  

Abstract

The dose rate from gamma radiation in the SLOWPOKE-2 (Safe Low-Power Kritical Experiment) reactor at Royal Military College (RMC) was measured using two methods. PMMA (polymethylmethacrylate) dosimeters were used to determine the dose rate at the bottom of the inner irradiation tubes, and a silica fibre-optic bundle was used to find a profile of the dose rate in the inner and outer irradiation tubes. The average gamma dose rate as determined by the PMMA dosimeters in the inner tubes of the SLOWPOKE reactor at RMC was measured to be 5.43 kGy/h when the reactor is at full power and 0.023 kGy/h when the reactor is off. In the bottom 16 cm of the irradiation sites, the average dose rate as measured by the fibre bundle with the reactor off was 0.0507 kGy/h for the inner site, and 0.0136 kGy/h for the outer site. With the reactor on, the dose rate increased to 38.6 kGy/h and 44.3 kGy/h for the inner site and 15.4 kGy/h for the outer site. For PMMA, Longer irradiation times and several irradiations in each inner tube was determined necessary for future tests. For the fibre bundle, it was determined that An estimation of the gamma spectrum in a SLOWPOKE-2 reactor could be used along with the results from the fibre bundle to form a more accurate perception of the gamma dose rate in the reactor, as well as a simulation of the path lengths and patterns of Compton electrons of various energies.

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