IMPORTANT NUMBERS Flashcards
HCN Air/Odor Threshold
0.58 ppms
How many more times dangerous is HCN than CO?
24 times
When can SCBA use be discontinued during HCN monitoring?
when readings are under 5 (4.7) ppm
What is the STEL for HCN
15 minutes
What is the IDLH for HCN
50 ppm
What is the half life of HCN?
1 hour
What are some lethal doses of HCN?
270 PPM after 6-8 minutes
181 PPM after 10 minutes
135 PPM after 30 minutes
What is the ignition temperature of CO?
1128 degrees F
What is the flammable range of CO?
12.5%-74%
CO vapor density?
.968
rises because its lighter than air
What is a CO incident?
9ppm or less
What is a CO emergency
greater than 9PPM
How much greater of an affinity does CO have for hemoglobin compared to O2
210 times more
over 200ppm of o2 are required to replace 1 part of CO
Signal 1
Signal 2
Signal 3
1 Bomb Threat
2 Biological Threat
3 Chemical Threat
Mercury UN number
Hg UN 2809
What is the molecular weight of mercury?
MW 200.59
What is the PEL of mercury?
0.05% mg/cubic meter of air (m3)
What is the US DOT ERG for mercury
guide 172
What temperature does mercury vaporize from liquid to gas
59 degrees F
What is the flammable range for natural gas?
4%-15%
lighter than air
What type of meter must be used for natural gas
Combustible gas indicator
How far must non-emergency personnel be kept from a radiological scene
at least 500 ft
What scenario can entry be made into a radiological scene when the meter reads >100mr/hr?
only when it is necessary to treat injured persons or prevent spread of contamination
What is the distance of the controlled area for emergency personnel in radiological scenes?
100 ft from the scene, upwind if possible
What must a meter read in an uncontrolled area during radiological emergency?
<2mr/hr
What is considered to be radiological contamination based on readings from a Geiger or Ludlum type instrument with a pancake detector?
100cpm background or greater
