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Irradiations and Calibrations

PTB offers the determination of the response of neutron measuring instruments as a service. Reference quantities may be the neutron fluence Φ, or the ambient dose equivalent H*(10), or the personal dose equivalent Hp(10). The dose equivalent quantities are calculated from the spectral fluence. The conditions of the calibration - e.g. the required neutron energies, the fluence rates, the target distances, etc. - are adapted to the individual properties of the devices in agreement with the customer. Before an order is placed, a consultation is offered free of charge.

The table below gives a survey of the characteristics of the calibration fields which are most important for the user.

                   Mono-energetic neutron fields at the accelerator facility PIAF

Reaction
<En>
MeV
ΔE
MeV
Target
(dΦ/dt)
cm-2s-1
Φsc/Φ
%
(dH*(10)/dt)
mSv h-1
7Li (p,n) 7Be 0.024 0.010 Li 2.5•102 6.4 0.02
7Li (p,n) 7Be 0.144 0.015 Li 7.1•102 2.8 0.34
7Li (p,n) 7Be 0.250 0.012 Li 3.5•102 5.4 0.26
7Li (p,n) 7Be 0.565 0.009 Li 1.6•103 1.6 2.0
3H (p,n) 3He 1.2 0.108 Ti(T) 2.0•103 3.1 3.1
3H (p,n) 3He 2.5 0.127 Ti(T) 4.9•103 1.4 7.3
2H (p,n) 3He 5.0 0.200 D2-Gas 5.2•103 <1.0 7.5
2H (p,n) 3He 8.0 0.200 D2-Gas 1.9•104 <1.0 27.5
3H (d,n) 4He 14.8 0.431 Ti(T) 1.3•104 3.0 24.3
3H (d,n) 4He 19.0 0.300 Ti(T) 8.5•102 1.2 1.8

<En> and ΔEn are the mean energy and the width of the distribution of the mono-energetic neutrons. The maximum fluence rates and the ambient dose equivalent rates at a distance of 1 m from the production target are designated with (dΦ/dt) and (dH*(10)/dt). (Φsc/Φ) designates the fraction which the neutrons scattered in the target have in the total fluence.

The costs for services are charged according to PTB's price list. They consist of fixed cost components of 2240 € for each test report and 1020 € for each calibration field used as well as an hourly rate of 306 € for each beam tome time hour used for the irradiation of the test object (as of 08.10.2021). In special cases, an invoice according to the time expenses is also possible. Sales tax must be added to these prices.

For inquiries about irradiations and calibrations with monoenergetic neutrons please send an email to neutronenmetrologie(at)ptb.de.

For detector investigations and experiments in the field of research, EU‑financed user support is available if the requirements with regard to contents of the work are met.

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