Assessment of Nuclear Moisture Density Gauges Performed at The Secondary Standards Dosimetry Laboratory in Ghana for the Period December 2015 – December 2017

Document Type: Original Paper

Authors

1 Radiation Protection Institute Ghana Atomic Energy Commission P.O.Box LG 80 Atomic, Kwabenya

2 Health Physics and Instrumentation Centre, Radiation Protection Institute, Ghana Atomic Energy Commission, Ghana

3 Nuclear Safety and Safeguards Centre, Radiation Protection Institute, Ghana Atomic Energy Commission, Accra

4 Health Physics and Instrumentation Centre, Radiation Protection Institute, Ghana Atomic Energy Commission, Accra

5 Radiation Protection Institute, Ghana Atomic Energy Commission, Accra

6 Radiation Protection Institute, Ghana Atomic Energy Commission Box LG 80, Legon. Ghana

Abstract

The radiation safety assessment reports of nuclear moisture density gauges which were assessed by the Radiation Protection Institute (RPI) of the Ghana Atomic Energy Commission (GAEC) have been reviewed. All the devices with model 3440 were manufactured by Troxler Inc. and Canberra Eurisys. Radiagem 2000 Survey Meter; together with Canberra Eurisys Probe were used for the dose rates and wipe tests measurements respectively. The results of dose rate measurements very close to the various sides of each of the devices when gauge is OFF and source in SAFE position ranged between 34.68 - 92.80 μSv/ hr, and at a distance of one(1) metre the readings ranged between 0.36 – 14.53 μSv/ hr . Also when the devices are ON and source in SAFE position the readings very close to the source ranged between 33.23 – 127.00 μSv/ hr, and at a distance of one (1) metre the readings ranged between 0.42 – 15.16 μSv/ hr. The background radiation dose rate at the location of the assessment and measurements also ranged between 0.07 – 2.06 μSv/ hr). Furthermore the dry wipe tests had results ranging between 0.58 – 2.81cps whiles that for the wet wipe tests ranged between 0.74 – 2.39 cps. The results show that there is no significant difference between the sets of values obtained from the dry and wet wipe tests. It can also be inferred that the results show there is no contamination on the surfaces of the devices. The results of the standard counts (calibration) performed are also presented in this paper.

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Articles in Press, Accepted Manuscript
Available Online from 10 February 2019
  • Receive Date: 06 October 2018
  • Revise Date: 30 January 2019
  • Accept Date: 10 February 2019