30angle:  E[keV] = 0.0158507 *ch-2.07456
90angle:  E[keV] = 0.01950*ch-2.76
145angle: E[keV] = 0.017988  *ch-1.809

I could identify 2 peaks in the 241Am spectra and 4 peaks in the 133Ba. These peaks are fitted with a gaussian to get their position --> linear energy calibration for the combined (Am+Ba) data sets for each detector. The function I used: E(ch) [keV] = m*ch+b

#gaus fit, gaus fit error, literature (nndc), literature error
#literature used:
#https://www.nndc.bnl.gov/nudat2/decaysearchdirect.jsp?nuc=241AM&unc=nds
#https://www.nndc.bnl.gov/nudat2/decaysearchdirect.jsp?nuc=133BA&unc=nds
#where there is no error given, I put +/-.5 to the last digit
1.79319e+03 3.88460e-01 26.3446 0.0002
3.88726e+03 1.00448e-01 59.5409 0.0001
2.08381e+03 5.25334e-02 30.973 0.0005
2.33719e+03 3.17859e-02 34.987 0.0005
3.48482e+03 1.03952e-01 53.1622 0.0006
5.24059e+03 2.54968e-02 80.9979 0.0011