Table II.

Allowable monitor units per week for walls.

Lead (mm)	Concrete (mm)	Noncontrolled
		Distance to occupied area (meters)
		1	2	3	4	5
0	0	600	2400	5 400	9 500	15 000
5	25	800	3100	7 100	13 000	19 600
10	50	1000	4200	9 300	17 000	26 000
15	75	1400	5500	12 000	22 000	34 000
20	100	1800	7200	16 000	29 000	45 000
25	125	2400	9600	22 000	38 000	59 800

1000 MU/min
Controlled
Lead (mm)	Concrete (mm)	Distance to occupied area (meters)
		1	2	3	4	5
0	0	29 700	120 000	270 000	480 000	740 000
5	25	39 000	160 000	350 000	630 000	980 000
10	50	52 000	210 000	470 000	830 000	1 300 000
15	75	69 000	270 000	620 000	1 100 000	1 700 000
20	100	91 000	360 000	810 000	1 400 000	2 300 000
25	125	120 000	480 000	1 100 000	1 900 000	2 980 000
1000 MU/min