DISEASE CHARACTERISTICS: Histologically or cytologically confirmed B-cell malignancy, including B-cell non-Hodgkin's lymphoma or B-cell chronic lymphocytic leukemia, that has failed at least one regimen of standard chemotherapy At least 1 confirmed tumor site by radiolabeled LL2 IgG No greater than 25% bone or bone marrow involvement No brain metastases

PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 70-100% ECOG 0-2 Life expectancy: At least 3 months Hematopoietic: WBC at least 3,000/mm3 Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 mg/dL AST and alkaline phosphatase less than 1.5 times upper limit of normal (ULN) (except for bone involvement) Renal: Creatinine less than 1.5 times ULN Other: Not pregnant Fertile patients must use effective contraception during and for 3-6 months after study HIV negative No severe anorexia, nausea, or vomiting No other significant concurrent medical condition that would interfere with compliance

PRIOR CONCURRENT THERAPY: Biologic therapy: Prior murine monoclonal antibody therapy allowed (if unreactive to yttrium Y 90-labeled humanized anti-CD22 monoclonal antibody LL2 by HPLC or ELISA test) Chemotherapy: At least 4 weeks since prior chemotherapy Endocrine therapy: At least 2 weeks since prior corticosteroids (except for adrenal insufficiency) Radiotherapy: At least 4 weeks since prior radiotherapy to the index lesion No prior extensive radiotherapy to greater than 25% of bone marrow (except total body irradiation as part of bone marrow or stem cell transplantation regimen with engraftment of functional marrow (i.e., producing normal peripheral blood counts) No prior maximum tolerated dose levels of radiotherapy to critical organs (e.g., lung, liver, or kidney) Surgery: At least 4 weeks since prior major surgery Other: No other concurrent investigational agents