RTI Piranha, Reference Manual, Page: 31 / 181

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