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Monitoring of radiation in the environment in the Netherlands. Results in 2000 | RIVM

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Alpha activity concentration in Bq/m3

<2.5 2.5 - 3.0 3.0 - 3.5 3.5 - 4.0

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RIVM report 610056047

Gamma radiation level in nSv/h

<60 60 - 75 75 - 90 >90 Gamma radiation level in nSv/h <60 60 - 75 75 - 90 >90 0 km 50

Figure 4.3: Spatial variation in the average ambient dose equivalent rate in 2000. The dots represent the locations of the dose equivalent rate monitors.

Figure 4.4: Yearly averages of the ambient dose equivalent rate.

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page 44 of 55 RIVM report 610056047

Table A4: Precipitation per month and 3H-, long-lived gross α- and gross β-activity in

deposition sampled at RIVM in 2000.

Month Precipitation 3H Gross αααα Gross ββββ

2000 mm Bq·m-2 Bq·m-2 Bq·m-2 January 52.1 72 ± 20 1.6 ± 0.4 5.5 ± 0.5 February 124.1 < 149 3.6 ± 0.4 10.1 ± 0.9 March 54.9 < 66 1.3 ± 0.2 7.0 ± 0.7 April 33.6 < 40 1.3 ± 0.2 4.2 ± 0.4 May 65.9 < 79 4.7 ± 0.5 11.1 ± 1.0 June 79.2 < 95 2.9 ± 0.4 8.2 ± 0.8 July 112.3 168 ± 44 4.0 ± 0.4 9.7 ± 0.9 August 35.5 76 ± 16 3.5 ± 0.4 10.4 ± 1.0 September 70.7 < 85 2.3 ± 0.3 7.7 ± 0.7 October 125.1 < 249 4.6 ± 0.5 15.1 ± 1.4 November 105.0 < 178 3.6 ± 0.4 7.9 ± 0.7 December 77.1 < 131 2.0 ± 0.3 7.1 ± 0.7 Total 935 < 1390 35.2 ± 1.3 (1) 104 ± 3 (1)

(1) The error in the sum is equal to the square root of the sum of the squared monthly errors. Errors are given as

1σ.

Table A5: Yearly totals (1) for long-lived gross α- and gross β-, 3H-, 210Pb- and 210Po-activity

in deposition for 1983 – 2000 [8].

Year Precipitation Gross αααα Gross ββββ 3H 210Pb (2) 210Po (2)

mm Bq·m-2 Bq·m-2 Bq·m-2 Bq·m-2 Bq·m-2 1983 869 40 120 2100 - -1984 868 25 130 2610 - -1985 767 30 140 3800 - -1986 825 45 18000 2400 15 3 1987 975 24 ± 1 (3) 85 ± 3 (3) 2630 52 6 1988 887 36 ± 2 103 ± 3 1700 ± 40 110 ± 3 25 ± 1 1989 706 43 ± 1 89 ± 3 1560 ± 130 94 ± 7 24 ± 4 1990 756 68 ± 1 121 ± 4 1360 ± 120 85 ± 4 16 ± 2 1991 699 48 ± 1 85 ± 1 1060 ± 50 56 ± 1 10 ± 1 1992 946 44 ± 1 87 ± 1 1440 ± 50 83 ± 5 11 ± 1 1993 886 54.3 ± 0.7 87.9 ± 0.8 1310 ± 30 78 ± 3 6.0 ± 0.6 1994 1039 52.0 ± 0.7 91.2 ± 1.0 1210 ± 30 82 ± 3 12.7 ± 0.7 1995 724 39 ± 4 95 ± 8 970 ± 40 - (4) - (4) 1996 626 16.4 ± 1.5 67 ± 5 970 ± 50 57 ± 3 9 ± 2 1997 760 23.1 ± 1.3 87 ± 3 1160 ± 60 80 ± 3 < 10 1998 1238 31.1 ± 1.3 106 ± 3 1200 ± 110 91 ± 4 < 16 1999 916 25.5 ± 1.0 84 ± 2 1530 ± 110 - (5) < 5.1 2000 935 35.2 ± 1.3 104 ± 3 < 1390 - < 7.8

(1) Errors are given as 1σ. (4) Result rejected [23].

(2) Data from α-spectroscopy. (5)α-spectroscopy analysis of 210Pb stopped in 1999. (3) Introduction of new method. (-) No analysis.

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Afbeelding

Figure 4.3: Spatial variation in the average ambient dose equivalent rate in 2000. The dots represent the locations of the dose equivalent rate monitors.
Table A5: Yearly totals  (1)  for long-lived gross α-  and gross β-,  3 H-,  210 Pb- and  210 Po-activity in deposition for 1983 – 2000 [8].

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