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. 4 dated 30.03.2022

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:

For payments under the present Contract valid banking details of the Seller are the following:

Isotope - Regional Alliance,

Joint-Stock Company (Isotope JSC), 119435, Moscow, 22 Pogodinskaya str.

Acc. № [**] in Gazprombank (Open Joint-stock Company)

SWIFT: GAZPRUMM

All other terms and conditions are in accordance with Contract No. 840/08625142/31/22-21, Addendum 1-3.

The present Addendum No.4 is an integral part of the Contract and may be signed via facsimile or e- mail.

/s/ Konstantin Ershov, Head of Supplies, April 11, 2022 THE SELLER /s/ Jonathan Hunt, CFO, April 4, 2022 THE BUYER