A semiconductor telescope spectrometer for

β

ray spectra and the associated program for analysis of

β

spectra have been built and tested. The spectrometer consists of a

ΔE

detector (0.3mm×200mm

2

Si (Au) ) and an E detector (15mm×500mm

2

Hp Ge) . Its energy resolution for single energy electrons is 20keV. Multibranch

β

spectra can conveniently be analyzed

and then their endpoint energies and branching ratios can be obtained by means of the program

in which the response function of the telescope has been taken into account. The endpoint energies and branching ratios for three well known

β

emitters

i. e.

152

Eu

90

Y and

56

Mn

have been extracted experimentally

which are in good agreement with published results. Since the HP Ge detector is rather thin

it can also be used as a low energy

γ

ray detector.