Determination of soil, sand and ore primordial radionuclide concentrations by full-spectrum analyses of high-purity germanium detector spectra

Newman, R.T.; Lindsay, R.; Maphoto, K.P.; Mlwilo, N A; Mohanty, A. K.; Roux, D. G.; Meijer, R.J. de; Hlatshwayo, I.N.

doi:10.1016/j.apradiso.2008.02.025

Cited by 27 publications

(9 citation statements)

References 4 publications

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“…The gamma-lines of 609.3 keV, 1120 keV (from 238 U series), 583.2 keV, 727.3 keV, and 795 keV ( 232 Th series) were omitted from the analyses as sensitivity analysis has shown elsewhere that they are affected by coincidence summing [9]. The 40 K was measured from its gamma line energy of 1460.8 keV.…”

Section: Methodsmentioning

confidence: 99%

Natural Radioactivity in Soil and Water from Likuyu Village in the Neighborhood of Mkuju Uranium Deposit

Mohammed

Mazunga

2013

International Journal of Analytical Chemistry

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The discovery of high concentration uranium deposit at Mkuju, southern part of Tanzania, has brought concern about the levels of natural radioactivity at villages in the neighborhood of the deposit. This study determined the radioactivity levels of 30 soil samples and 20 water samples from Likuyu village which is 54 km east of the uranium deposit. The concentrations of the natural radionuclides 238U, 232Th, and 40K were determined using low level gamma spectrometry of the Tanzania Atomic Energy Commission (TAEC) Laboratory in Arusha. The average radioactivity concentrations obtained in soil samples for 238U (51.7 Bq/kg), 232Th (36.4 Bq/kg), and 40K (564.3 Bq/kg) were higher than the worldwide average concentrations value of these radionuclides reported by UNSCEAR, 2000. The average activity concentration value of 238U (2.35 Bq/L) and 232Th (1.85 Bq/L) in water samples was similar and comparable to their mean concentrations in the control sample collected from Nduluma River in Arusha.

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Section: Methodsmentioning

confidence: 99%

Natural Radioactivity in Soil and Water from Likuyu Village in the Neighborhood of Mkuju Uranium Deposit

Mohammed

Mazunga

2013

International Journal of Analytical Chemistry

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“…The MEDUSA system comprises a CsI(Na) detector which is interfaced with GPS receiver. The lead-shielded HPGe detector is a Canberra (model GC4520) p-type detector (45% relative efficiency at 1.33 MeV, 2.2 keV FWHM energy resolution at 1332 keV) with crystal diameter 62.5 mm, and length 59.9 mm (Newman, et al, 2008). The MEDUSA detector was mounted ∼0.5 m above the ground on the front of a 4 × 4 vehicle to traverse (at ∼2 m · s −1 ) the accessible portions of the iTL grounds.…”

Section: Experimental Methodsmentioning

confidence: 99%

In-situgamma-ray mapping of environmental radioactivity atiThemba LABS and associated risk assessment

Hlatshwayo

2009

Radioprotection

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Abstract.In-situ and ex-situ measurements of environmental radioactivity were made on the iThemba LABS (iTL) grounds in South Africa. The MEDUSA and HPGe detector systems were used to make insitu and ex-situ measurements, respectively. The MEDUSA was mounted ∼0.5 m above the ground on a 4 × 4 vehicle to traverse [at ∼2 m · s −1 ] the accessible portions of the iTL grounds. Spatial data (via a GPS receiver) were acquired every 1 s, and -ray spectra every 2 s. MEDUSA count rate maps were produced to show the spatial distribution of radioactivity on the grounds. The HPGe was used to measure the radioactivity in soil (and also in some grass) samples collected at particular spots on the iTL grounds. The sampled spots include six identified high activity spots ("hot spots") and two "calibration spots". The activity concentrations were determined for both the natural and anthropogenic radionuclides. The absorbed and effective doses (from external -ray irradiation) were also determined for the natural and anthropogenic radionuclides. The maximum effective dose to humans on the iTL grounds as a result of external exposure to natural and anthropogenic radionuclides was found to be well below the regulatory 1 mSv per year per member of public.

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“…Th at 185.7 keV (Gilmore, 2008;Newman et al, 2008). Strongly populated gamma-ray transitions identified in the soil spectra were used to calculate the activity concentration along with the uncertainty associated with each specific radioisotope.…”

Section: Activity Concentration Determinationmentioning

confidence: 99%

Soil radioactivity levels, radiological maps and risk assessment for the state of Kuwait

et al. 2016

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Determination of soil, sand and ore primordial radionuclide concentrations by full-spectrum analyses of high-purity germanium detector spectra

Cited by 27 publications

References 4 publications

Natural Radioactivity in Soil and Water from Likuyu Village in the Neighborhood of Mkuju Uranium Deposit

Natural Radioactivity in Soil and Water from Likuyu Village in the Neighborhood of Mkuju Uranium Deposit

In-situgamma-ray mapping of environmental radioactivity atiThemba LABS and associated risk assessment

Soil radioactivity levels, radiological maps and risk assessment for the state of Kuwait

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