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arxiv: 2505.07979 · v3 · submitted 2025-05-12 · ✦ hep-ex · physics.ins-det

Demonstration of Efficient Radon Removal by Silver-Zeolite in a Dark Matter Detector

Daniel Durnford , Yuqi Deng , Carter Garrah , Patrick B. O'Brien , Philippe Gros , Michel Gros , Jos\'e Busto , Steven Kuznicki
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Marie-C\'ecile Piro
This is my paper

Pith reviewed 2026-05-22 16:02 UTC · model grok-4.3

classification ✦ hep-ex physics.ins-det
keywords radon removalsilver-zeolitedark matter detectoractivated charcoalradon trapspherical proportional counterbackground reductionrare event search
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The pith

Silver-zeolite captures radon three orders of magnitude better than activated charcoal at room temperature.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper tests silver-zeolite Ag-ETS-10 as a radon trap inside a spherical proportional counter filled with argon and methane. It finds that this material reduces radon levels far more effectively than the activated charcoal used in most experiments today. The improvement reaches three orders of magnitude under the tested conditions. Because radon creates a major background in rare-event searches, a better trap could raise the sensitivity of dark matter and neutrino detectors. The work also points to possible uses in underground labs that need clean environments.

Core claim

Silver-zeolite Ag-ETS-10 removes radon from an argon/methane gas mixture at room temperature with an efficiency three orders of magnitude higher than that of activated charcoal, as measured by the reduction observed in a spherical proportional counter, and is therefore presented as a promising adsorbent for lowering backgrounds in dark matter and neutrino detectors.

What carries the argument

Silver-zeolite Ag-ETS-10 acting as a selective radon adsorbent that binds radon atoms much more strongly than activated charcoal does.

If this is right

  • Radon traps built with silver-zeolite could be added to existing dark matter and neutrino experiments to lower their background rates.
  • Underground laboratories could adopt silver-zeolite systems for general radon control with smaller volumes or lower maintenance than charcoal beds.
  • The same material may support cleaner environments for other rare-event searches that are limited by radon daughters.
  • Operational advantages such as room-temperature use could simplify the design of future radon filtration units.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the material keeps its performance in xenon or at low temperatures, detector designs could shrink the size of their radon removal stages.
  • Long-term stability tests under realistic gas flows would show whether repeated exposure reduces the zeolite's capacity.
  • The same adsorbent might help control radon in non-physics settings such as air quality monitoring in mines or homes.

Load-bearing premise

The radon-capture performance measured at room temperature in argon and methane will remain equally strong when the material is placed inside full-scale detectors that run at different temperatures or with different gases.

What would settle it

A direct measurement in a working dark matter detector that shows the radon reduction factor falling below 100 times better than charcoal when the silver-zeolite is operated at cryogenic temperatures or in xenon.

read the original abstract

We present the performance of an efficient radon trap using silver-zeolite Ag-ETS-10, measured with a spherical proportional counter filled with an argon/methane mixture. Our study compares the radon reduction capabilities of silver-zeolite and the widely used activated charcoal, both at room temperature. We demonstrate that silver-zeolite significantly outperforms activated charcoal by three orders of magnitude in radon capture. Given that radon is a major background contaminant in rare event searches, our findings highlight silver-zeolite as a highly promising adsorbent, offering compelling operational advantages for both current and future dark matter and neutrino physics experiments. Furthermore, this not only offers great promise for developing future radon reduction systems in underground laboratories, but also paves the way for innovative, multidisciplinary advancements with far-reaching implications in science, engineering and environmental health.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript reports an experimental demonstration of radon removal using silver-zeolite Ag-ETS-10 inside a spherical proportional counter filled with an Ar/CH4 mixture at room temperature. Direct comparison measurements show that Ag-ETS-10 achieves a radon reduction factor three orders of magnitude higher than that of activated charcoal under the tested conditions, with the results positioned as relevant for background mitigation in dark matter and neutrino detectors.

Significance. If the measured performance advantage is shown to persist under the gas compositions and temperatures used in full-scale dark matter and neutrino experiments, the work would provide a practically useful improvement in radon suppression for rare-event searches. The use of a detector prototype for the measurement adds direct relevance, though the absence of scaling arguments or additional data for xenon or cryogenic conditions limits the immediate applicability to the stated goals.

major comments (1)
  1. [Abstract and §5] Abstract and §5 (Conclusions): The central claim that silver-zeolite 'offers compelling operational advantages for both current and future dark matter and neutrino physics experiments' rests on the three-order-of-magnitude outperformance measured in Ar/CH4 at ~300 K. No adsorption isotherm data, kinetic measurements, or scaling arguments are supplied to establish that the relative advantage survives replacement of the carrier gas by xenon or operation at cryogenic temperatures, where competitive adsorption and temperature dependence are known to change zeolite performance by factors of 10–100.
minor comments (2)
  1. [§3] §3 (Experimental setup): The description of the gas flow, pressure, and radon injection method should explicitly state the total gas volume, flow rate, and any corrections applied for the spherical counter geometry to allow independent reproduction of the reduction factor.
  2. [Results figure] Figure 2 or equivalent results plot: Error bars on the radon reduction factors and the precise definition of 'reduction factor' (e.g., ratio of steady-state concentrations with and without adsorbent) should be clarified to confirm the quoted three-order-of-magnitude difference.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive comments on our manuscript. We address the major concern regarding the scope of our claims and the applicability of the measured performance advantage to xenon-based or cryogenic systems below.

read point-by-point responses

  1. Referee: [Abstract and §5] Abstract and §5 (Conclusions): The central claim that silver-zeolite 'offers compelling operational advantages for both current and future dark matter and neutrino physics experiments' rests on the three-order-of-magnitude outperformance measured in Ar/CH4 at ~300 K. No adsorption isotherm data, kinetic measurements, or scaling arguments are supplied to establish that the relative advantage survives replacement of the carrier gas by xenon or operation at cryogenic temperatures, where competitive adsorption and temperature dependence are known to change zeolite performance by factors of 10–100.

    Authors: We agree that our measurements were performed exclusively in an Ar/CH4 mixture at room temperature (~300 K) inside a spherical proportional counter and that we have not supplied adsorption isotherms, kinetic data, or scaling arguments for xenon or cryogenic operation. These omissions are correct, and factors such as competitive adsorption and temperature dependence can alter zeolite performance. However, the Ar/CH4 mixture and spherical proportional counter geometry are directly relevant to existing dark matter searches (e.g., NEWS-G), where radon mitigation at room temperature is a current operational need. The three-order-of-magnitude improvement over activated charcoal demonstrated under these conditions therefore constitutes a practical advance for such detectors. We do not claim that the relative advantage necessarily persists unchanged when the carrier gas is replaced by xenon or at cryogenic temperatures. To address the referee’s point, we will revise the abstract and §5 to qualify the claims explicitly, stating the tested conditions and noting that further studies are required to evaluate performance under xenon or low-temperature regimes relevant to other experiments. revision: yes

Circularity Check

0 steps flagged

No circularity: pure experimental comparison of radon capture performance

full rationale

The paper reports direct laboratory measurements of radon reduction factors for silver-zeolite Ag-ETS-10 versus activated charcoal inside a spherical proportional counter filled with Ar/CH4 at room temperature. The central result (three-orders-of-magnitude outperformance) is obtained by comparing observed count-rate reductions in the same detector geometry and gas mixture; no equations, fitted parameters, or model predictions are invoked that could reduce to the input data by construction. No self-citations are used to justify uniqueness theorems or ansatzes, and the work contains no derivation chain. The result is therefore self-contained empirical evidence rather than a tautological restatement of its own inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No free parameters, axioms, or invented entities are introduced; the work is a direct experimental comparison of two adsorbents.

pith-pipeline@v0.9.0 · 5700 in / 925 out tokens · 30990 ms · 2026-05-22T16:02:38.209783+00:00 · methodology

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Reference graph

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