RTI Piranha - Page 31

2. Description of the Piranha
Hardware and Specifications
2014-06/5.5C
27
Piranha & QABrowser Reference Manual
Pulses
Parameter
Range
Dose/pulse
1 nGy/pulse - 3 kGy/pulse
1
Pulse dose rate
Lower limit 10 µGy/s (70 mR/min), otherwise same
as for air kerma rate.
Min. output peak doserate
- High Sensitivity
- Low Sensitivity
Doserate (min. pulse width)
0.23 µGy/s (4 ms) / 1.8 µGy/s (0.5 ms)
10 µGy/s (4 ms) / 73 µGy/s (0.5 ms)
Pulse rate
- Normally
0.5 – 100 Hz, resolution 0.5 Hz
Pulse width
4 ms - 2000 s
Duty cycle
5 - 95 %
Minimum pulse width
pulse width (min. peak doserate)
4 ms (0.23 µGy/s) / 0.5 ms (1.8 µGy/s)
Minimum ripple
(pulse top to bottom)
50 %
Irradiation time
1 – 65535 pulses, resolution 1 pulse
Note 1: Max dose/pulse depends on the pulse length.
Waveform recording time
At max sampling rate
1024 ms (2 kSa/s)
At min sampling rate
524 s (4 Sa/s)
A total of 8 recording times are available, all separated by a factor of 2, i.e. 1, 2, 4, 8,
16, 33, 66, 131, 262 and 524 seconds.
The setting for Waveform recording time may affect the Irradiation time
calculation. Make sure to set back the Waveform recording time to the
lowest choice after temporarily modifying it. Please also note that in
QABrowser, the waveforms are limited to between 0.32 and 4 seconds.
The table below shows the typical response for the Piranha External Dose Probe at
standardised radiation qualities.
Radiation quality
Mean energy
air kerma
(keV)
Total
Filtration
(mm Al)
Air kerma measurement
PTB
ISO 4037
IEC 61267
HVL
(mm Al)
Factor kQ
(Rel. RQR 5)
DV40
RQR 2
26,38
2,49
1,42
1,087
DV50
RQR 3
29,0
2,46
1,77
1,044
DV60
RQR 4
32,0
2,68
2,19
1,013
DV70
RQR 5
34,8
2,83
2,57
1
DV80
RQR 6
37,8
2,99
3,01
0,993
DV90
RQR 7
41,0
3,18
3,48
0,988
DV100
RQR 8
44,2
3,36
3,96
0,986
DV120
RQR 9
50,8
3,73
5,00
0,986
DV150
RQR 10
61,2
4,38
6,55
1,002