Article:

Abstract

This paper describes ultrapurification of isotopically enriched calcium and molybdenum com pounds and ⁴⁰Ca¹⁰⁰MoO₄ calcium molybdate growth charge in order to remove radioactive uranium, thorium, and radium impurities. ⁴⁰Ca¹⁰⁰MoO₄ single crystals grown from such charges are needed for the fabrication of scintillator elements of the cryogenic detector for the AMoRE project: a search for ¹⁰⁰Mo neutrinoless double-beta decay.

Conclusion

We developed a technique for ultrapurification of isotopically enriched calcium formate and obtained a product with a 226Ra (214Bi) content of 1.4 mBq/kg. A ⁴⁰Ca¹⁰⁰MoO4 calcium molybdate growth charge was prepared through precipitation from aqueous solution. Its purity was as follows: 0.3 × 10–7 wt % U, 0.9 × 10–7 wt % Th, and 1.6 mBq/kg 226Ra.

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