Ivestigate Radon radioactive contamination level i

(Chinese Institute of Radiation Protection,Taiyuan030006China.)

Radon and her daughters indoor affected amost People’ health, So a law was promulgated about atmosphere quality indoor in china 18 Dec in 2002 , We commenced an investigation about Radon indoor in our institue in Taiyuan.

1.Measuring method

We made use of our Chinese standerd measuring methods to the radon level of atmosphere and water and wall and soil , and the exhalation rate of the floor and the wall indoor in one litter area in Taiyuan.We used REM-Ⅲ Radon Exhalation Rate apparatus,DHZM-ⅠRadon Continuous Measuring Instrument,and FD-125 Radon Measuring Instrument ,It’s scale coefficien is 18.24 cpm /（Bq˙m^-3）. We reseach the radioactive contamination root in the exhalation of soil and building material, radon outdoor ,the contributor for the water and the wall indoor and soil.

2. Measuring result

We made use of the common measuring methods to the radon level of atmosphere and water and wall , and the exhalation rate of the floor and the wall indoor.Table 1, Table 2, Table 3, Table 4.

Table 1 Radon Measuring result indoor and outdoor

	Radon concentration（Bq/m³）		PAEC 10^-8J/m³		Radon Exhalation Rate mBq/（m²·s）
Type	outdoor	indoor	outdoor	indoor	floor	wall
1	91.5±5.50	8.80±1.32	2.89±0.53	2.83±1.52	19.74±4.36	13.59±2.95
2	54.65±5.02	10.42±2.71	1.52±0.54	0.17±0.53	19.38±5.27	29.58±4.57
3	53.9±3.55	6.21±1.50	0.74±0.51	0.4±0.50	18.03±3.52	17.23±4.30
4	30.7±2.54	3.66±0.46	1.06±0.23	0.12±0.54	3.52±1.59	5.29±2.13
5	29.73±5.52	10.66±1.93	0.6±0.19	0.43±0.59	7.10±2.48	1.33±0.42
6	8.29±5.58	6.33±1.62	4.19±1.11	3.80±1.51	5.19±1.31	1.49±0.51
7	9.40±1.57	8.71±1.56	0.15±0.02	0.21±0.12	5.22±1.57	2.63±0.90
8	13.66±2.20	8.23±1.32	0.20±0.03	0.26±0.20	2.48±1.53	2.52±1.14
9	11.53±2.32	5.20±1.16	0.27±0.12	0.31±0.02	2.04±0.52	1.50±0.51
10	6.58±1.22	4.46±1.28	0.24±0.07	0.29±0.17	2.14±0.51	1.76±0.44
11	9.39±1.13	5.49±1.74	2.03±1.11	2.49±0.50	15.90±3.42	2.32±1.20
12	6.47±1.31	4.18±0.23	2.6±0.32	2.69±0.51	3.23±0.42	3.86±1.54
13	8.48±2.84	4.47±0.52	4.71±0.53	3.80±0.52	1.84±0.31	6.25±2.62
15	9.94±2.70	13.97±2.39	5.36±0.62	4.25±1.53	2.51±0.63	2.80±1.21
16	6.88±1.49	7.43±1.56	4.21±0.30	5.44±2.56	2.22±0.52	1.76±0.40
17	6.00±1.95	6.11±1.54	2.96±1.57	3.05±1.51	29.74±6.54	1.95±0.75
18	98.13±5.93	13.78±2.53	16.11±2.22	4.77±1.54	23.35±5.50	6.55±1.54
19	17.28±3.62	9.35±1.89	6.32±1.32	4.60±1.50	11.90±2.36	6.50±2.42
20	20.68±3.47	10.58±1.53	5.24±2.53	5.62±1.54	6.50±1.57	5.11±1.56
21	18.41±5.90	16.67±2.29	8.10±1.79	3.89±0.72	4.61±1.43	4.70±0.52
22	30.80±9.44	16.67±2.53	9.01±2.62	3.89±0.41	4.84±1.34	4.66±1.43
23	21.89±2.32	6.96±0.52	8.05±1.51	2.71±0.54	l.04±0.42	7.30±1.92
average	26.42	8.64

Table 2 Radon concentration in water

L Type	Quantiy	℃	C_Rn（kBq/m³）	Type	Quantiy	℃	C_Rn（kBq/m³）
1#	8	18	6.03±1.73	7#	4	17	7.36±2.40
2#	4	17	4.39±1.48