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