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Probe head: Brass alloy
Mode(s)
Substrate
Alloy Plus, Mining, Mining
316 stainless
Plus, GeoChem 1, 3-Beam
Al (319 AA)
Soil 2, HalFree 1, RoHS 1
EC 680K
(plastic)
Soil (SiO
)
2
RoHS 1, 4-Beam RoHS 1
PVC-Blank
(plastic), RoHS 2, 4-Beam
EC 680K
RoHS 2 (alloy)
71X SR2 (solder)
Al (319 AA)
Alloy, Mining
316 stainless
Soil (SiO
)
2
Alloy Plus 3
316 stainless
Al (319 AA)
Alloy Plus 2
316 stainless
Al (319 AA)
Alloy 2
316 stainless
Al (319 AA)
3-Beam Soil 1
Soil (SiO
)
2
3-Beam Soil 1
Soil (SiO
)
2
RoHS 2 (alloy)
316 stainless
Al (319 AA)
Geochem 2, Mining Plus 2
Soil (SiO
)
2
Mining Plus
Soil (SiO
)
2
3-Beam Soil 3
Soil (SiO
)
2
Lead 2
71X SR2 (solder)
Lead 1
71X SR2 (solder)
HalFree 2
EC 680K
HalFree 2
EC 680K
a. Table revision D, January 2013.
b. Brass probe head for DELTA models sold in Japan, and 50 kV models sold in Canada.
c. To convert measurements to mR/h, divide results by 10.
d. Probe head only = No shield in place.
e. Probe shield = Standard probe shield in place.
f. BK = Background reading (< 1 μSv/h).
Table 2 Radiation profile
Model: DELTA Series
Ludlum Model 3
Ludlum Model 2241
44-7 probe
44-172 probe
Measured dose rate in µSv/h
Voltage (kV)
Amperage
Filter
Trigger — T
(µA)
Probe head
only
d
40
100
Aluminum
BK
f
BK
50
20
50
80
Copper
25
60
BK
1
35
100
Aluminum
BK
BK
8
200
Open
BK
BK
13
200
Open
BK
BK
15
200
Iron
BK
BK
50
80
Copper
70
50 #
60 #
Copper
30
40
100
Copper
BK
40
100
Copper
BK
BK
10
200
Open
BK
50
80
Copper
100
50 #
15 #
Copper
15
15
200
Thin
BK
aluminum
18
200
Aluminum
BK
25
100
Aluminum
BK
10
200
Open
BK
12
200
Open
BK
a
— Brass probe head
b
Performed
Validated by: M. L. Tremblay
by:
F. Cook
R. Nasella
c
— Secondary radiation (scatter)
Close — F
5 cm — F1
Probe shield
Probe head
Probe shield
Probe head
Probe shield
e
only
only
BK
BK
BK
BK
BK
5
BK
BK
7
1500
950
700
4
850
300
500
5
650
400
600
9
1500
1000
1500
BK
BK
BK
BK
BK
25
15
10
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
4
BK
BK
BK
BK
BK
BK
BK
4
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
7
1000
500
750
5
750
370
550
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
10
1750
750
750
4
300
170
160
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
3
BK
1
BK
3
BK
1
Date: Oct. 2012 and Jan. 2013
10 cm—F2
30 cm (calculated)
Probe head
Probe shield
Probe head
Probe shield
only
only
BK
BK
BK
BK
BK
BK
BK
BK
370
400
160
26
280
200
110
19
200
120
60
22
1000
750
200
56
BK
BK
BK
BK
10
6
5
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
350
300
50
28
500
170
110
21
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
350
300
28
100
80
40
6
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
14
10
7
37
BK
BK
BK
BK
BK
BK
BK
BK
BK
BK
13
19
BK
BK
BK
BK
13
4
BK
BK
BK
BK
BK
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