An Experimental Apparatus for Monitoring Radon during Compression of Coal/Rock Samples and Its Preliminary Application

Table 1

The measured radon concentrations of three samples.

Time (min)	#1 sample (Bq/m^3)	#2 sample (Bq/m^3)	#3 sample (Bq/m^3)
5	477	473	472
10	451	421	349
15	433	386	297
20	417	359	273
25	406	337	258
30	396	323	248
35	384	312	244
40	374	304	240
45	368	299	237
50	360	296	238
55	356	297	239
60	353	296	239
65	352	298	238
70	352	296	242
75	349	299	240
80	350	299	242
85	348	302	242
90	347	300	242
95	347	302	244
100	349	304	244
105	348	304	245
110	349	302	245
115	348	302	246
120	349	302	249