Conclusions
1Success ul calib a ions we e conduc ed a PTB and LNHB wi h p ima y
adon ac i i y s anda ds wi h unce ain ies < 1.5 % a 300 Bq/m3,< 1.7 % a
130 Bq/m3and < 2.5 % a 55 Bq/m3. The unce ain y using an
AlphaGUARD was < 3.5 % a 55 Bq/m3(Table 1, Fig. 2a).
2The dynamic mode (ac i i y decay o build-up) p o ed unsui able o
calib a ion o use -g ade elec onic de ec o s in his ac i i y ange (Fig.2b).
3The linea i y o RadonEye +2 in he ange 50 Bq/m3- 300 Bq/m3was
demons a ed (Fig.2a). Dynamic backg ound co ec ion, uni e sal o non-
spec ome ic de ec o s, was applied (Fig.3).
4The unknown pulse-p ocessing algo i hm o RadonEyes +2 dis o s he
Poisson dis ibu ion o he signal and inc eases s a is ical a ia ion (Fig.4).
On he echniques o p ima y
calib a ion o elec onic adon de ec o s
K. Mi e 1, B. Sabo 2, V. Todo o 1, S. Geo gie 1, S. Pie e2,
S. Rö ge 3, B. K as e 1,4, I. Dimi o a1,*
1 So ia Uni e si y “S . Klimen Oh idski” (SU), Bulga ia
2 Uni e si é Pa is-Saclay, CEA, LIST, Labo a oi e Na ional Hen i Becque el (LNE-LNHB), F ance
3 Physikalisch-Technische Bundesans al (PTB), Ge many
4 Depa men o Radio he apy, Uni e si y Oncology Hospi al “P o . I an Che nozemski”, Bulga ia
Acknowledgemen s: This wo k is suppo ed by he p ojec RadonNET (23IND07), which ecei ed unding om he Eu opean Pa ne ship on Me ology (ID:
10.13039/100019599), co- inanced om he Eu opean Union’s Ho izon Eu ope Resea ch and Inno a ion P og amme and by he Pa icipa ing S a es.
This wo k is suppo ed by he Eu opean Union Nex Gene a ionEU, h ough he Na ional Reco e y and Resilience Plan o he Republic o Bulga ia, p ojec
No BG-RRP-2.004-0008-C01.
*di [email protected] ia.bg
Sou ce
Unce ain y
(k=1)
Re e en ac i i y
Rn s anda d el.
unc.
P ima y
: LNHB: 0.8 % - 1 %; PTB - IRSD: 1 % - 1.2 %
Seconda y
(AlphaGUARD) - 2.5 %
Volume el.
unc
.
P ima y
: due o inac i e olume o de ec o s: LNHB: 0.8 %; PTB: 0.15 %
Seconda y
: N/A
Decay
co ec ion
He me ic
olume: negligible;
Non
-he me ic: 1.5 % - 7 % depending on ime and dec ease a e unc.
S a . unc.
P ima y
: N/A ; Seconda y: ~ 1 % a . s . de . a 55 Bq/m3 o 15 days
RadonEye
S a . Unc
Dynamic
mode: i slope unc.: 0.5 % - 1 %;
S a ic
mode ( el. s . de . o a e age):
<1 % a 300 Bq/m3 o 6 days, <2 % a 55 Bq/m3 o 15 days
Channel
c oss
-
alk abs. unc,
Bq/m3
1
Bq/m3
RadonEye
backg ound
abs
. unc., Bq/m
3
Due
o s a . unc. and build-up co ec ion: 0.1 Bq/m3- 0.6 Bq/m3;
Due
o channel c oss- alk: 1 Bq/m3
To al
In e al
50 Bq/m3-2000 Bq/m3: 1 % - 2 % (LNHB, p ima y
)
A
300 Bq/m3: 1.3 % - 1.4 % (LNHB, p ima y);3.7 % (LNHB, seconda y
)
A
130 Bq/m3: 1.6 %- 1.7 % (PTB, p ima y); 2.8 % (PTB, seconda y
)
A
55 Bq/m3: 2.3 % - 2.4 % (PTB, p ima y); 3.4 % (PTB, seconda y)
In oDUCTION
Expe imen al
Resul s
Calib a ions and es s o use -g ade elec onic adon de ec o s a low ac i i y
concen a ions (≤ 300 Bq/m3) a e needed when using hem o es compliancy
wi h he e e ence le els indoo o o ou doo moni o ing. Exposu es o
elec onic adon de ec o s (RadonEye +2) a adon ac i i y concen a ions
down o 50 Bq/m3we e conduc ed a PTB and LNHB.
Fig.1. (a) The exposu e sys em a PTB; (b) The exposu e chambe wi h he
RadonEye +2 and AlphaGUARD; (c) Da a om he IRSD o PTB; (d) Radon
ac i i y concen a ions du ing he 3 exposu e sessions - he las a 55.56(60)
Bq/m3was main ained o mo e han 3 mon hs.
Exposu es a PTB:Mode 1: Build-up o 222Rn ac i i y; Mode 2: Cons an
ac i i y a pla eau a e 25 days o build-up. P ima y s anda d: absolu e adon
emana ion a e measu emen in ime by IRSD sou ce.AlphaGUARD included.
Exposu es a LNHB: Mode 1: Decaying ac i i y ce i ied by he p ima y
de ined solid angle 222Rn s anda d; Mode 2: Cons an ac i i y in open sys em
secu ed by mass- low con olle and sou ce emana ion a e aceable o he
p ima y ho on s anda d.AlphaGUARD included as seconda y s anda d.
Fig.3. (a) Inc ease o RadonEye +2 backg ound (do s) be ween exposu e
sessions due o p e ious exposu e ( ed line) and 210Po con ibu ion. Dynamic
backg ound co ec ion (blue line) applied by es ima ing 210Pb build-up;
(b) 210Pb decay da a by Nucléide – La a used in he Ba eman equa ions.
ab
c
d
Table 1. Unce ain y budge in calib a ions o elec onic adon de ec o s.
Fig.2. (a) Calib a ion ac o s (measu ed o e e en alue) de e mined a low
ac i i y exposu es a cons an ac i i y a PTB by IRSD p ima y s anda d and
AlphaGUARD. (b) Radon ac i i y concen a ion a decay mode and i s
s a is ical a ia ions (>10 % below 100 Bq/m3; >20 % below 50 Bq/m3).
Fig.4. Dis ibu ion o RadonEye +2 signal dis o ed by ounding and unknown
p ocessing algo i hm. The small sensi i i y o compac use -g ade de ec o s
leads o gaps. The do s ma k he Poisson dis ibu ion o deduced coun s.
ab
ab
