Fluke Biomedical RAYSAFE 452 Mode D'emploi page 16

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Air kerma, K
air
Range
0 µGy/h – 1 Gy/h (0 µR/h – 114 R/h)
Rate resolution
0.01 µGy/h (1 µR/h) or 3 digits
Dose resolution
0.1 nGy, (0.01 µR) or 3 digits
Energy range
30 keV – 7 MeV
Energy response
> 20 µGy/h (2.3 mR/h)
1
and T < 30 °C (86 °F)
otherwise
Minimum X-ray pulse length
5 ms at T < 30 °C (86 °F)
2
Minimum linac frequency
2, 3
100 Hz at T < 30 °C (86 °F)
Rate response time
~2 s to detect a step from 0.2 to 2 µGy/h
(23 to 230 µR/h)
Units
Gy
rad (1 rad = 1/100 Gy)
R (1 R = 1/114.1 Gy)
Mean photon energy, Ē
Range
20 keV – 600 keV
Uncertainty
10 % at < 100 keV, 20 % otherwise
Defining standard
ISO 4037-1:2019
Minimum dose rate
5
20 µSv/h (2 mrem/h) or 20 µGy/h (2.3 mR/h),
at T < 30 °C (86 °F)
Counter (α, β, γ)
Detector type
Geiger-Müller pancake
Window
Mica, 1.5 – 2 mg/cm
Sensitive area
15.55 cm
Range
0 cps – 20 kcps (0 cpm – 1.2 Mcpm)
Rate resolution
0.1 cps (1 cpm) or 3 digits
Counter resolution
1 count or 3 digits
RaySafe 452 – Users Manual (EN)
±15 %, 30 keV – 5 MeV
±25 %, 5 MeV – 7 MeV
±30 %, 30 keV – 1 MeV
−25 % – +120 %,1 MeV – 7 MeV
2
2
, behind 79 % open steel grid
Dead time correction
Automatic, linearity within −10 % – +30 %
Typical background at 0.1 µSv/h 0.5 cps (30 cpm)
Typical gamma sensitivity,
Cs 6 cps / µGy/h (3000 cpm / mR/h)
137
Rate response time
~2 s to detect a step from 1 to 10 cps
(60 to 600 cpm)
Units
cps
cpm (1 cpm = 1/60 cps)
2π emission sensitivity
6
Radionuclide Decay (E
14
60
36
90
239
241
FOOTNOTES
1.
The instrument uses a Geiger-Müller pancake at low rates and a cluster of solid-state sensors at higher rates.
The rate where the solid-state sensors are fully engaged gradually increase with temperature, for temperatures
above 30 °C (86 °F).
2.
Limit where the response is within ±20 % of the response at continuous radiation. Above 30 °C (86 °F) the
instrument's ability to handle low linac pulse rates and short X-ray pulses gradually declines with increasing
temperature.
3.
Refers to the microwave pulse repetition frequency of typical medical linear accelerators. Each pulse has a
typical duration of a few µs.
4.
Ranges where the instrument fulfills IEC 60846-1:2009.
5.
Above 30 °C (86 °F) the minimum dose rate gradually increases with increasing temperature.
6.
Measured at 3 mm distance between instrument housing (without lid) and wide area class 2 sources according
to ISO 8769:2010.
16
Typical
)
max
efficiency
C
β
(0.16 MeV)
15 %
Co
β
(0.32 MeV)
31 %
Cl
β
(0.71 MeV)
43 %
Sr /
Y
β
(0.55 / 2.28 MeV)
49 %
90
Pu
α (5.16 MeV)
26 %
Am
α (5.49 MeV)
26 %

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