Open Access
Table 6
Average and total content of Ni-63 calculated for the population of 87 drums using simple random sampling (SRS), systematic sampling (SYS) and bootstrap (Boot). The relative error ε is calculated twice, with and without values below DL.
| Sampling techniques | Population with DL | Population without DL | ε | |||||
|---|---|---|---|---|---|---|---|---|
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| a̅ Ni-63 (Bq/g) | SE (Bq/g) | Tot. Ni-63 (MBq) | a̅ Ni-63 (Bq/g) | SE (Bq/g) | Tot. Ni-63 (MBq) | With DL | Without DL | |
| Census | 0.53 | 0.04 | ∼4.52 | 0.65 | 0.05 | ∼5.54 | – | – |
| SRS (5%, n = 4), (5%, n = 3) | 0.705 | 0.07 | ∼6 | 0.53 | 0.13 | ∼5.37 | 33.02% | −18.46% |
| SRS (10%, n = 9), (10%, n = 6) | 0.28 | 0.05 | ∼2.39 | 0.58 | 0.07 | ∼5.28 | −47.17% | −10.77% |
| SRS (25%, n = 22), (25%, n = 16) | 0.52 | 0.11 | ∼4.43 | 0.69 | 0.12 | ∼5.37 | −1.9% | 6.15% |
| SRS (50%, n = 44), (50%, n = 32) | 0.5 | 0.04 | ∼4.26 | 0.68 | 0.05 | ∼5.88 | −5.7% | 4.61% |
| SYS (5%, n = 4), (5%, n = 3) | 0.65 | 0.22 | ∼5.54 | 0.66 | 0.13 | ∼5.6 | 22.64% | 1.54% |
| SYS (10%, n = 9), (10%, n = 6) | 0.48 | 0.06 | ∼4.09 | 0.65 | 0.08 | ∼5.54 | −9.43% | 0 |
| SYS (25%, n = 22), (25%, n = 16) | 0.46 | 0.06 | ∼3.92 | 0.57 | 0.04 | ∼4.86 | −13.21% | −12.31% |
| SYS (50%, n = 44), (50%, n = 32) | 0.56 | 0.07 | ∼4.77 | 0.71 | 0.08 | ∼6.05 | 5.66% | 9.23% |
| Boot (n = 5, N = 250) | 0.33 | 0.08 | ∼2.81 | 0.51 | 0.07 | ∼4.36 | −37.74% | −21.23% |
| Boot (n = 10, N = 250) | 0.75 | 0.21 | ∼6.39 | 0.6 | 0.05 | ∼5.11 | 41.51% | −7.69% |
| Boot (n = 20, N = 250) | 0.54 | 0.08 | ∼4.6 | 0.61 | 0.05 | ∼5.2 | 1.89% | −6.15% |
| Boot (n = 5, N = 500) | 0.415 | 0.11 | ∼3.54 | 0.56 | 0.22 | ∼4.77 | −21.7% | −13.84% |
| Boot (n = 10, N = 500) | 0.665 | 0.11 | ∼5.67 | 0.64 | 0.04 | ∼5.45 | 25.47% | −1.54% |
| Boot (n = 20, N = 500) | 0.52 | 0.06 | ∼4.43 | 0.6 | 0.07 | ∼5.11 | −1.89% | −7.69% |
| Boot (n = 5, N = 1000) | 0.63 | 0.2 | ∼5.39 | 0.65 | 0.13 | ∼5.54 | 19.24% | 0 |
| Boot (n = 10, N = 1000) | 0.4 | 0.04 | ∼3.41 | 0.65 | 0.11 | ∼5.54 | −24.53% | 0 |
| Boot (n = 20, N = 1000) | 0.53 | 0.07 | ∼4.52 | 0.68 | 0.09 | ∼5.79 | 0 | 4.61% |
| Min | 0.28 | – | 2.39 | 0.51 | – | 4.36 | 0 | 0 |
| Max | 0.75 | – | 6.39 | 0.71 | – | 6.05 | −47.17% | −21.23% |
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