Milliroentgen/Hour

Physical Threat

Time

2.5mr/hr

Current Standard

8 Hr Day

OSHA Rules

100mr/hr

Threshold

8 Hr Day

OSHA Rules

10,000 mr/hr

Blood Changes

Not Good

450000 Mr/Hr=450r/hr

Serious Injury/Death

Bad

Counts Per Minute cpm :beta window open

Milliroentgen Per Hour mr/hr :beta window closed.

Counter Setting

cpm

Counter Setting

Mr/Hr

X1

0-300 cpm

X1

0-0.5 mr/hr

X10

0-3000 cpm

X10

0-5.0 mr/hr

X100

0-30000 cpm

X100

0-50 mr/hr

600 C/M=1 Mr/Hr

600

X

1

Operational Check Source is Pb 210 and Bi 210 both are beta emitters.