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Hidex LSCs

LSC 2013 Barcelona

4.9.2013 2

On Sunday March 24th Hidex is celebrating 20 years in the liquid

scintillation counting community. Method to validate beef needed?

Contents

Hidex 300 SL overview

Different models of Hidex 300 SL

Highlights of example data

Bayesian statistics

New methods for Strontium measurements

Triathler Becquerel Finder

Hidex 300 SL

Automatic Liquid Scintillation Counter

Hidex 300 SL

• Samples in trays

• Only commercial TDCR

counter on the market

• Powerful alpha/beta

separation

• Variety of options

Hidex 300 SL

super low level

• Improved lead shield design

• Guard detectors for active

shielding

• Cooling system recommend

for improved counting

efficiencies

• A dedicated table

Product offering for Hidex 300 SL

Hidex 300 SL

Metrology

1. Special TDCR version with all

possible data output for TDCR

calculations

2. Options available

Hidex 300 SL

Super Low Level

1. Top of the range performance

2. Recommend for

environmental applications

and high performance

research needs

Hidex 300 SL

standard

1. Standard model with many

options

1. Low leve PM tubes

2. Alpha Beta separation

3. External Standard

4. Cooling of instrument

Software

Windows 7 compatible

Extensive application library and excellent support

Combination of different parameter files is possible

Example data

Hidex 300 SL recent application highlights

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Example data – high luminescence

3ml 2M NaOH + 17 ml OptiPhase HiSafe 3

Extremely high luminescence – Triple Coincidences are OK immediately

3mL 2M NaOH +17mL Hionic Fluor

Even here we see some luminescence but again Triple Coincidences are OK immediately

Example data – Blood samples

Blood sample with red color

H-3 counting efficiency of less than 5%

Three PM tubes gave better counting efficiency compared to other commercial LSC

TDCR gave outstanding quench correction results 59000 DPM sample doped with 61000 DPM

Alpha Beta separation

0 4

8 12

16 20

24 28

0 4 8

12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96

100 104

0

96

192

288

384

480

576

672

768

864

960

Rn extracted into Maxilightht

Graphical tool is very

powerful for optimising alpha

beta separation settings

0

4

8

12

16

20

24

28

0

64

128

192

256

320

384

448

512

576

640

704

768

832

896

960

Bayesian statistics in LSC

More realistic approach to measurement uncertainty

• Incorporates also so called type b errors such as

error of calibration source

International norm ISO 11929 came into effect

Quality management becomes increasingly important

in LSC (accredited labs must apply ISO 11929)

Demand for calculation of characteristic limits after ISO

11929

14

15

Example calculations for Hidex 300 SL

Hidex together with FCI in Germany and help from KIT prepared a

MS Excel worksheet to calculate the characteristic limits according

to ISO 11929 (with calibration source)

MikroWin software template

Both solution now available from Hidex

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Conclusion on Bayesian statistics

Thomas Bayes provided a more realistic approach to measurement uncertainty

Bayesian statistic will be increasingly important for LSC measurements and quality management

The differences between Bayesian and conventional statistics are comparably small when it comes to LSC (but not negligible)

The application of ISO 11929 for LSC is relatively easy and first templates are available

Rapid measurement of

Strontium with TDCR-Cerenkov

method

0.300

0.400

0.500

0.600

0.700

0.800

0.900

0.300 0.400 0.500 0.600 0.700 0.800 0.900 1.000

Eff

TDCR

Y-90 Cerenkov TDCR vs. Real efficiency (PTB, Germany)

Measurement steps for Sr-90/Y-90

Samples can be measured immediately after sample preparation e.g.

Radiochemical separation:

Y-90 measured immediately with TDCR-Čerenkov-Counting

After adding cocktail Sr-90/Y-90 measured in standard LSC mode

Amount of Sr-90 calculated with substraction

Results with Hidex 300 SL (Februar 2013)

Sample Čerenkov

(Y-90)

Bq in Vial

LSC

(Sr-90, Y-90)

Bq in Vial

Sr-90

(Difference of

LSC-Čerenkov)

Bq in Vial

True activity

(Sr-90)

Bq in Vial

1 1,214 2,351 1,137 1,006

2 0,107 0,219 0,111 0,100

3 0,049 0,115 0,066 0,050

4 0,023 0,053 0,031 0,025

Triathler

Becquerel

finder Products for nuclear safety

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Products for Nuclear safety

On March 11, 2011 magnitude

9.0 earthquake shook the

Tohoku region in Japan. A

resulting Tsunami caused

horrible damage.

The tsunami also hit the

Fukushima Daiichi nuclear

power plant resulting in a series

of overheatings and explosions

in the reactors.

Isotopes after fallout Gamma emitters

I-131

Cs-134 and Cs-137

Beta emitters

Sr-89, Sr-90

Alpha emitters

Pu-239 and Am-241

Must be monitored in

Baby food,

Dairy produce

Other Foodstuff,

Liquid foodstuff,

Triathler multilabel tester

Triathler multilabel tester offers good

mobile capability to measure gamma

isotopes with the internal well type NaI

detector. The Triathler is small, can be

equipped with a field case with battery or

can be operated directly from 12V DC

cigarette lighter plug. Triathler NaI detector

accepts tubes and vials with 13 mm

diameter.

Becquerel Finder

The Triathler NaI system and external NaI

detector is available with alternative Lead

shield and planar type NaI detector. This

enables the use of so called Marinelli

Beakers. This gives the possibility to use

large sample volumes of 1L and minimum

detectable activity is dramatically reduced.

Marinelli beaker is placed around the NaI

detector which allows total sample volume

of 1L and thus decreases the minimum

detectable activities significantly.

Detection of Beta emitters

Both Triathler LSC and MLT are equipped with the

possibility to measure beta emitters from various

sample matrices. Water samples can be measured

directly, but other sample matrices can present

challenges and may require extensive sample

preparation procedures. In emergency response Sr-

90 is important isotope. Triathler has been employed

in several studies to measure Sr-90 from water, urine

or nasal swab samples. Also food and soil samples

have been measured.

Eichrom and Triskem International provide

radiochemistry methods for measurement of Sr-90

from food and milk.

Detection of Alpha emitters

Triathler is also suitable for detecting alpha

emitting isotopes. Triathler has been used in

several publications and studies for especially Am-

241 in an emergency setup. Triathler LSC and MLT

are available with the alpha beta separation that

provides extremely sensitive instrument for alpha

emitters. Applications vary from measurement of

water to urine and even nasal swabs.

Radiochemistry requirements must be considered

Aknowledgements

PTB Braunschweig: Dr. Kossert

LUFA-ITL GmbH Kiel: Mr. Otto, Mr. Schrade

DWD Offenbach: Mrs. Diedrich-Roesch, Dr. Steinkopff,

Dr. Dalheimer

KIT Karlsruhe: Dr. Hoeppener-Kramar, Mrs. Zieger,

Mr. Wilhelm, Mr. Genzer

Thank you!

For more information

please do not hesitate

to contact us

Mustionkatu 2

FI-20750 Turku

info@hidex.com

www.hidex.com

Tel. +358 10 843 5570

Fax +358 2 241 0075