Measure With Lid; Measurement Parameters - Fluke Biomedical RAYSAFE 452 Manual Del Usuario

MEASURE WITH LID

Select which lid to use (Ambient or Air kerma).
1. Mount the lid.
2. Position the instrument with the sensors (the flat area of the lid)
facing the radiation source.
The instrument handles its two sensor systems seamlessly, for both
continuous sources of radiation, and for intermittent sources. See
"Intermittent radiation sources" on page 10.
The instrument has no zero adjust functionality, and measurements
include background radiation.

Measurement parameters

Dose and dose rate
Dose is all dose accumulated during the current measurement.
Dose rate uses an algorithm that detects radiation changes with a
response time of a few seconds or less, but may in some cases need
more time to stabilize, according to Table 2 on page 9.
RaySafe 452 – Users Manual (EN)
DOSE RATE
(µGy/h, µSv/h)
≤ 0.1
0.3
1
3
10
30
100
≥ 300
Table 2. Dose rate stabilization times.
NOTE Dose rate readings may need additional time to stabilize on
a lower value after high radiation levels, due to afterglow of
scintillators in the solid-state sensors.
NOTE The instrument is not sensitive to neutrons. This has been
tested using thermal neutrons from a moderated
source. The response was found to be less than 5 % of the
neutron ambient dose equivalent.
Peak dose rate
Peak dose rate is the highest displayed dose rate reading since last
reset. See definition of dose rate.
NOTE The instrument detects muons, created when interstellar high
energy particles from the Milky Way crashes into the Earth's
atmosphere. The muons interact with the solid-state sensors
(when measuring with lid) and create short (1–2 s) dose rate
pulses of approximately 100 times background. At sea level,
9
TIME TO MAX
DOSE RATE
(mrad/h, mR/h, mrem/h) STABILITY
≤ 0.01
0.03
0.1
0.3
1
3
10
≥ 30
241
60 s
30 s
10 s
10 s
10 s
10 s
5 s
2 s
Am-Be