Thermo Scientific RADEYE B20-ER Short Operation Manual

Short Operation Manual
First Responder Kit
FOR RADEYE B20/B20-ER
1
The RadEye B20 / B20-ER should be operated at a location with low The RadEye B20 / B20-ER should be operated at a location with low
radiation background. Measurements mode should be performed at radiation background. Measurements mode should be performed at
different locations for the determination of the best spot for the setup. different locations for the determination of the best spot for the setup.
2
Perform a Perform a

background measurement

background measurement
inside the sample holder, at least once per day. Leave the planchet or inside the sample holder, at least once per day. Leave the planchet or
jar empty and set the RadEye's background measurement time (t ) to jar empty and set the RadEye's background measurement time (t ) to
1800 s 1800 s (recommended) and the total counts to 9999. The derived (recommended) and the total counts to 9999. The derived
background value must be stored (RadEye Display: Save value background value must be stored (RadEye Display: Save value
3
Set the Set the

scaler measurement time

scaler measurement time
Initial Sample Check: Recommended time t [s] = 300 Initial Sample Check: Recommended time t [s] = 300
Impact of measurement time can be seen from the formular at the bottom of this page. Extented measurement times Impact of measurement time can be seen from the formular at the bottom of this page. Extented measurement times
(sample and background time) improve the detection limit. Please see the below stated simplified formula. (sample and background time) improve the detection limit. Please see the below stated simplified formula.
4
Check that the operation mode of the RadEye B20/B20-ER is set to Check that the operation mode of the RadEye B20/B20-ER is set to
scaler mode. scaler mode. The net result [cps] will be provided directly by the The net result [cps] will be provided directly by the
RadEye B20/B20-ER if the RadEye B20/B20-ER if the
5
Perform the sample measurements according to page 2. Verify the actual background radiation level on a regular basis. Perform the sample measurements according to page 2. Verify the actual background radiation level on a regular basis.
Calculate the Bq result by using the below stated formula: Calculate the Bq result by using the below stated formula:
Net result [cps]
The calibration factor "F" is typically 5 Bq / cps (approx. 20% Beta efficiency for Cesium and Iodine mixtures). The calibration factor "F" is typically 5 Bq / cps (approx. 20% Beta efficiency for Cesium and Iodine mixtures).
Practical Hints: Practical Hints:
Please see page 2 for a described measurement procedure with related I-131 calibration factor. Please see page 2 for a described measurement procedure with related I-131 calibration factor.
Solid samples: Solid samples: Only beta radiation from the top surface facing the detector can be measured. I Only beta radiation from the top surface facing the detector can be measured. I
the sample around and measure again. the sample around and measure again.
Simplified formula for the detection limit calculation: Simplified formula for the detection limit calculation:
Detection Limit = 3.3 x Detection Limit = 3.3 x
Thermo Fisher Scientific Messtechnik GmbH, 91056 Erlangen, Frauenauracherstr. 96, Germany, Phone +49 9131 998 0 - DK-021E110419 - Fri/Fro - DK-021E.cdr
with the RadEye B20 / B20-ER with the RadEye B20 / B20-ER
(t ) of the RadEye B20/B20-ER (t ) of the RadEye B20/B20-ER
m
Scaler netto Scaler netto function is active. function is active.
X
Liquid samples Liquid samples : Only beta radiation from top layer of liquid is contributing to the measurement result. : Only beta radiation from top layer of liquid is contributing to the measurement result.
F
x x
1 (2)
Radiation Measurement & Security Instruments
o
à à
Yes). Yes).
m
=
F
[ Bq / cps]
R = Background Count Rate [cps] R = Background Count Rate [cps]
R R
o o
o
+ +
t = Measurement Time [s] t = Measurement Time [s]
m
t t
m o
t = Background Measurement Time [s] t = Background Measurement Time [s]
o
Result [Bq]
f appropriate, then turn f appropriate, then turn
The formula allows
the determination of
the limit of detection.
Increasing t lowers
the limit of detection.
m