RADIACS

Question 1

What are the four rules of remembering RADIAC instruments?

Answer 1

1. 4/10 RADIACS are Scintillating, one is the alpha contamination probe (DT-681/PDQ), the rest are Internal monitoring probes (all gamma, FASTSCAN, MCA, IM-253/PD with SPA-3).
2. 4/10 RADIACS are Gas Filled Chamber (GFC) in the Geiger Mueller Region.
   - IM-265/PDQ is for gamma radiation.
   - Add the DT-680/PDQ, you get gamma and Beta radiation
   - Use the DT-304/PDR (with the 265/PDQ or the 271/PDQ you change to CONTAMINATION and get gamma and beta.
3. The AN/PDR-70 or IM-216, is a neutron radiation detector that works as a GFC in the proportional region. Neutron radiation is the only use for this region.
4. Finally is the IM-231, which is an ion channel gamma/beta radiation detector.

Question 2

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-231 detector.

Answer 2

Gas-Filled Chamber
Ion-channel region
Gamma and Beta
Survey = Radiation

Question 3

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-216 (AN/PDR-70) detector.

Answer 3

Gas-Filled Chamber
Proportional Region
Neutrons (the only use of the prop region)
Survey = Radiation

Question 4

Name the Mode of Operation, the type of radiation detected, and the survey mode of the FASTSCAN detector.

Answer 4

This is an Internal Monitoring Survey RADIAC.

All INT Monitors are scintillating and gamma radiation specific.

Question 5

Name the Mode of Operation, the type of radiation detected, and the survey mode of the MCA detector.

Answer 5

This is an Internal Monitoring Survey RADIAC.

All INT Monitors are scintillating and gamma radiation specific.

Question 6

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-253/PD detector with the SPA-3 Probe.

Answer 6

This is an Internal Monitoring Survey RADIAC.

All INT Monitors are scintillating and gamma radiation specific.

Question 7

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-265/PDQ detector.

Answer 7

The base for the gas-filled chamber in the Geiger-Mueller Region, used for gamma.
Survey = Radiation.

Question 8

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-265/PDQ detector with the DT-680/PDQ probe.

Answer 8

Remember the 265/PDQ is GFC in GM, gamma radiation. This probe just adds Beta capability.

Question 9

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-265/PDQ detector with the DT-304/PDR probe.

Answer 9

Remember the 265/PDQ is GFC in GM, gamma radiation. This probe just adds Beta capability and has the protective surrounding that makes it a contamination probe.

Question 10

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-271/PDQ detector with the DT-304/PDR probe.

Answer 10

EXACT SAME as 265 with 304 because the 304 probe takes over; GFC in GM region, gamma and beta contamination.

Question 11

Name the Mode of Operation, the type of radiation detected, and the survey mode of the IM-265/PDQ detector with the DT-681/PDQ probe.

Answer 11

The 681/PDQ probe completely changes the function to an alpha contamination survey with a scintillating mode (this is the only scintillating mode RADIAC that isn’t internal monitoring).