Overview
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Key numbers
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- by cooking or other means. Potassium-40 was found to contribute the highest activity in all the food
- products. The activity concentration of 40K, 238U and 232Th in local prepared diets ranged between 60
- of the measured radionuclide contents in the food crops. It ranged between 0.2 mSv y1 (beans) and
- rice. For instance, the consumption of rice represents about 9% of total calorie intake. Per cap-
- ita consumption per annum of rice is about 24.8 kg (Olayemi, 1998; see also Table 5). While
- one food group: cereals. It has been found that cereals account for over 64% of the average
- six sub-areas of about 3 km2. The full range of food items identified could not be collected at each sam-
- through a preamplifier base. The detector has a resolution of about 8% at 0.662 MeV, which is capable
- analyzed ranged between 80 g and 200 g for the food samples while a uniform mass of 200 g was used
- errors in Tables 2 and 3 are combined uncertainties in the counting measurements. As shown in
- Table 2, 232Th exhibited the highest activity concentrations in soils at virtually all the sampling
- 2006). Table 3 shows that 40K was highest in all the food samples despite having the lowest
- 17.2 Bq kg1, respectively. As shown in Table 4, there appears to be removal of radionuclides
- from foodstuffs during cooking when compared with the values in Table 3. The percent reduc-
- and these values are presented in Table 3. The food consumption statistics used for the different
- Organization (FAO) data, are presented in Table 5. In this study, the calculation of individual
- (ii) Local individuals who obtain 10% of their food from a disturbed soil.
- clide activity concentrations shown in Table 4. Generally, the dose from ingestion of radionu-
- Till, J.E., Moore, R.E., 1988. A pathway analysis approach for determining acceptable levels of contamination of
Methods (brief)
- Plateau, Nigeria were collected and analyzed by gamma spectrometry to measure their contents of 40K,
- U and 232Th. As well as collecting samples, in situ dose rates on farms were measured using a precali-
- six sub-areas of about 3 km2. The full range of food items identified could not be collected at each sam-
- effort was made to ensure adequate collection of representative samples of the food crops identified in the
- study area. The different food items collected and the number of each sample is presented in Table 1. Soil
- samples were collected to a depth of 150 mm from four different points in the farms where food samples
- were collected and, thereafter, thoroughly mixed together to provide a representative sample for that site.
- The soil samples, after drying for several days at room temperature until a constant weight was
- reached, were crushed to pass through a 2 mm mesh sieve. The sieved samples were transferred into
- calibrated geometry sample containers and sealed in the same way as the soil samples.
- The food samples, after preparation, represent the raw foodstuffs which are sold in local markets to
- and groundnut into kulikuli (nut ball). After preparing samples in these ways they were analyzed for their
- The samples (food items, soil and local diets) were counted for 36,000 s (10 h) using a low-level
- The different samples of food items collected and their food group
- Food group Sub-food type: group/food Scientific names Number of samples
- radionuclide in the food and soil samples. The activity concentration in the samples was obtained using
- where C is the activity concentration of the radionuclide in the sample, Cn is the count rate under each
- transition probability of the specific g-ray and Ms is the mass of the sample (kg). The mass of samples
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Update history
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