Meters

Question 1

Name the areas within the gas amplification curve in order of increasing voltage.

Answer 1

Recombination
Ionization
Proportional
Limited Proportional
Geiger-Mueller
Continuous Discharge

Question 2

What are the pre-use checks on meters?

Answer 2

Audible response
Battery satisfactory
Current calibration
Validate no damage
Verify source check complete

Question 3

What are some common radiac failure modes?

Answer 3

Inaudible
Unsatisfactory battery level
Expired calibration
Damaged probe window, casing or damaged cord
Error codes on digital meters
Abnormal readings

Question 4

When a meter is discovered to have a failure mode, what are the actions?

Answer 4

Tag meter with maintenance tag (KAP-711)
Ensure meter is taken to RadCal facility
Document with RDR
Assess if previous surveys need to be re-performed

Question 5

Name two meters that can be used for beta-gamma readings? What type of probe will be used?

Answer 5

LMI-3
E600
RM-14
RM-14SA
Ludlum 3000
Ludlum 177

44-9 probe

Question 6

What type of detection method do alpha meters/probes (ASP-2s) use? Beta-gamma meters/probes?

Answer 6

Scintillation
Geiger-mueller

Question 7

What is the minimum sensitivity of a beta-gamma meter? Alpha meter?

Answer 7

100 ccpm
20 cpm

Question 8

What is the conversion factor from counts to pCi for beta-gamma readings? Alpha readings?

Answer 8

x4.5 for beta-gamma, x2.5 for alpha

Question 9

What is the maximum range of a Ludlum 3000 with a 44-9 probe? LMI 12-6 with a ASP-2 probe? E600 with a 44-9 probe?

Answer 9

999,000 cpm
50,000 cpm
3,480,000 cpm

Question 10

What is the minimum sensitivity of the RO-20 and RO-2 radiation meters?

Answer 10

0.1 and 0.2 mR/hr, respectively

Question 11

What type of probe does the Bic 50 use? What is that probes minimum sensitivity?

Answer 11

HP-270; 0.05 mR/hr