d. NBC 4 special. Take actions based on mission, enemy, terrain, troops, time available, and
civilian considerations (METT-TC) factors and recommendations of NBC personnel.
e. NBC 4 series. Determine the decay rate (n).
f. NBC 4 summary. Plot actual dose rates next to the points. If needed, plot additional normalized
points on an H + 1 or H + 48 overlay.
g. NBC 4 verification. Plot a zero dose rate next to the point. If needed, take action on very high
dose rates.
hazard created by fallout, the NBCC must continually receive, process, and update data from subordinate
units operating in or near the hazard area. This data normally is received in the form of NBC 4 (nuclear)
reports. If sufficient monitoring data is not received to evaluate the hazard, a ground or aerial survey may
be conducted to obtain additional information from specific areas or locations. To process incoming data
properly, you must
Check the reports for completeness of information.
Convert shielded dose rate readings to unshielded dose rate readings.
Normalize the data to an H + 1 or H + 48 reference time.
a. Check the reports. When radiological data is received, check the reports to ensure that you have
received sufficient information. You must receive the location of the reading, the time of the reading, the
dose rate reading, and sufficient information to compute a correlation factor (CF) if the reading was a
shielded reading. From the time of the reading, you must determine if the fallout is less than 48 hours
old. If so, and the information is from monitoring reports, you will use only the peak dose rate reports
and normalize them to H + 1 hour. If the information is from survey reports, you will use all of the
readings and normalize them to H + 1 hour. If the report is from a location where the fallout is 48 hours
old or longer, you will normalize the readings to H + 48 hours.
b. Convert shielded dose rates to unshielded dose rates. If the dose rate is a shielded reading, it
must be converted to an unshielded dose rate by multiplying the dose rate by the CF. Every vehicle has a
correlation factor. The CF for a ground vehicle (VCF) is dependent upon the amount of shielding
provided by the vehicle. The CF for an aircraft, air-to-ground CF (AGCF), is dependent upon the altitude
of the aircraft in addition to the amount of shielding provided by the aircraft. The CF is determined by
dividing the outside dose rate by the inside dose rate. If CF data is not available, use the vehicle or
structural CFs shown in Table A-5, Appendix A, page A-6.
PART B: NORMALIZE TO A COMMON REFERENCE TIME
5-3. General. Radiation-monitoring reports and radiological-survey data will provide dose rate readings
taken at many different times after the arrival of fallout in an area. To convert these dose rate readings
into meaningful, comparable information when posted to the situation map (SITMAP), they must be
normalized to a common reference time.
5-4. Normalize the Data to an H + 1 or H + 48 Reference Time. If the fallout is less than 48 hours
old, all readings will be normalized to H + 1 hour. If the fallout is greater than H + 48 hours, or for
contamination of unknown age, the readings will be normalized to H + 48 hours. Normalizing is done by
CM2306
5-2
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