Exhibit 10.2

Certain identified information has been excluded from this exhibit because it is both (i) not material and (ii) would be competitively harmful if publicly disclosed.

Addendum No. 6 dated 04.05.2022

Contract № 840/08625142/31/22-21

THE SELLER

Isotope - Regional Alliance, Joint-Stock Company (Isotope JSC)

Pogodinskaya str., 22,

Moscow, 119435, Russia.

Phone: +7 (495) 981-96-16/17

THE BUYER

The Company IsoRay Medical Inc.

350 Hills Street, Suite 106

Richland, WA 99354-5411 USA

THE BUYER and THE SELLER have mutually agreed on the following:

Paying party for the shipments under the current contract could be:

SphereRx, LLC

Chase Bank

Bank Code Type: ABA 325070760

Bank Code Type: Swift CHASUS33

Account: [**]

Account Name: SphereRx

All other terms and conditions are in accordance with Contract No. 840/08625142/31/22-21, Addendum 1-5.

The present Addendum No.6 is an integral part of the Contract and may be signed via facsimile or e-mail.

/s/ Konstantin Ershov, Head of Supplies, May 5, 2022 THE SELLER /s/ Jonathan Hunt, CFO, May 5, 2022 THE BUYER